79 results on '"F. Iga"'
Search Results
2. Divalent ion substitution effect on Yb-site in Kondo insulator YbB12
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W. Matsuhra, K. Yokomichi, W. Hirano, S. Kikuchi, N. Uematsu, H. Nakayama, A. Kondo, K. Kindo, and F. Iga
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Physics ,QC1-999 - Abstract
YbB12 has been investigated energetically as a typical Kondo insulator. To study detailed formation mechanism of Kondo energy gap, we have investigated transport and magnetic properties of Yb1-xR3+xB12 (R3+ = non-magnetic trivalent ions). Recently, we have recently succeeded in substitution of Ca2+ for Yb site in YbB12 by high-pressure synthesis. In Ca- and Lu-substituted alloys both of magnetic susceptibility and specific heat C/T at low temperatures, remarkably show larger increase than those of powdered YbB12. These increases are due to giant increase of density of state in an in-gap state.
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- 2018
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3. Magnetic properties of perovskite Ca1−xSrxFeO3
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H. Kawanaka, E. Kawawa, Y. Nishihara, F. Iga, A. Kondo, K. Kindo, and Y. Matsuda
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Physics ,QC1-999 - Abstract
We synthesized Ca1−xSrxFeO3 containing tetravalent iron Fe4+ with high valence by low temperature heat treatment along with ozone oxidization. We investigated the magnetic properties of perovskite Ca1−xSrxFeO3. The charge disproportionation transition temperature (TCD) of Ca1−xSrxFeO3 was observed from x = 0.0 to 0.6 in the magnetic susceptibility measurements. The decrease in TCD occurs is attributed to deformation of the crystal structure. The metamagnetic transitions with hysteresis were observed in the magnetization curves of all the compositions. The metamagnetic behavior is due to helical magnetism, which means that there are intermediate stable states before magnetization is saturated. In the Sr-rich region with x = 0.8 and 1.0, the saturation magnetization shows forced ferromagnetic order with a value of ∼3.2 μB at high magnetic field, H ∼ 60 T.
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- 2018
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4. Possible stripe phases in the multiple magnetization plateaus in TbB4 from single-crystal neutron diffraction under pulsed high magnetic fields
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N. Qureshi, F. Bourdarot, E. Ressouche, W. Knafo, F. Iga, S. Michimura, L.-P. Regnault, and F. Duc
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- 2022
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5. Point-Contact Spectroscopy Study of Kondo Insulator SmB6
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Takurou Harada, Kengo Okimura, Tatsuya Kawae, Yuji Inagaki, Masanobu Shiga, and F. Iga
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Point contact ,Materials science ,Condensed matter physics ,Kondo insulator ,Spectroscopy - Published
- 2020
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6. Different evolution of the intrinsic gap in strongly correlated SmB6 in contrast to YbB12
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J Yamaguchi, A Sekiyama, M Y Kimura, H Sugiyama, Y Tomida, G Funabashi, S Komori, T Balashov, W Wulfhekel, T Ito, S Kimura, A Higashiya, K Tamasaku, M Yabashi, T Ishikawa, S Yeo, S-I Lee, F Iga, T Takabatake, and S Suga
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Science ,Physics ,QC1-999 - Abstract
Dependence of the spectral functions near the Fermi level on temperature and rare-earth atom doping was studied in detail for strongly correlated alloys Sm _1− _x Eu _x B _6 and Yb _1− _x Lu _x B _12 by photoelectron spectroscopy at ∼8000 eV as well as at 7 and 8.4 eV. It was found that the 4f lattice coherence and intrinsic gap are robust for Sm _1− _x Eu _x B _6 at least up to the Eu substitution of x = 0.15 while both collapse by Lu substitution already at x = 0.125 for Yb _1− _x Lu _x B _12 . As for the temperature dependence of the spectral shapes near the Fermi level at low temperatures, rather contrasting results were observed between YbB _12 and SmB _6 . Although the gap shape does not change below 15 K for YbB _12 with the characteristic temperature T * of 80 K, the spectral shape of SmB _6 with a T * of 140 K shows that the peak beyond the gap is further increased below 15 K. The temperature dependence of the spectra near the intrinsic gap is clearly different between SmB _6 and YbB _12 , although both materials have so far been categorized in the same kind of strongly correlated semiconductor. The possibility of the surface contribution is discussed for SmB _6 .
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- 2013
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7. Hard x-ray photoemission study of Yb
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A, Rousuli, H, Sato, F, Iga, K, Hayashi, K, Ishii, T, Wada, T, Nagasaki, K, Mimura, H, Anzai, K, Ichiki, S, Ueda, A, Kondo, K, Kindo, T, Takabatake, K, Shimada, H, Namatame, and M, Taniguchi
- Abstract
We have carried out hard x-ray photoemission spectroscopy (HAXPES) of Yb
- Published
- 2017
8. Study of the DC Performance of Fabricated Magnetic Tunnel Junction Integrated on Back-End Metal Line of CMOS Circuits
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Takahiro Hanyu, Shoji Ikeda, Hideo Ohno, Masashi Kamiyanagi, Haruhiro Hasegawa, Jun Hayakawa, Tetsuo Endoh, F. Iga, and Katsuya Miura
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Magnetoresistive random-access memory ,Tunnel magnetoresistance ,Materials science ,CMOS ,business.industry ,Electrical engineering ,Spin-transfer torque ,Electrical and Electronic Engineering ,business ,Line (electrical engineering) ,Electronic, Optical and Magnetic Materials ,Electronic circuit - Published
- 2010
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9. Transient Characteristic of Fabricated Magnetic Tunnel Junction (MTJ) Programmed with CMOS Circuit
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Masashi Kamiyanagi, F. Iga, Shoji Ikeda, Jun Hayakawa, Haruhiro Hasegawa, Katsuya Miura, Hideo Ohno, Takahiro Hanyu, and Tetsuo Endoh
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Tunnel magnetoresistance ,Materials science ,CMOS ,business.industry ,Electrical engineering ,Spin-transfer torque ,Optoelectronics ,Transient (oscillation) ,Electrical and Electronic Engineering ,business ,Spin injection ,Electronic, Optical and Magnetic Materials - Published
- 2010
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10. Correction: Corrigendum: Emergent photovoltage on SmB6 surface upon bulk-gap evolution revealed by pump-and-probe photoemission spectroscopy
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Y. Ishida, T. Otsu, T. Shimada, M. Okawa, Y. Kobayashi, F. Iga, T. Takabatake, and S. Shin
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Multidisciplinary - Published
- 2015
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11. Infrared spectroscopy of the intermediate-valence semiconductor YbB12
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A. A. Volkov, Igor E. Spektor, Boris Gorshunov, A. S. Prokhorov, F. Iga, and Martin Dressel
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Permittivity ,Free electron model ,Effective mass (solid-state physics) ,Materials science ,Absorption spectroscopy ,Condensed matter physics ,Scattering ,Phonon ,General Physics and Astronomy ,Charge carrier ,Atomic physics ,Spectral line - Abstract
The dynamic conductivity and permittivity spectra of the intermediate-valence compound YbB12 are measured in the frequency range (6–104) cm−1 (quantum energy 0.75 meV-1.24 eV) at temperatures of 5–300 K. Analysis of the spectral singularities associated with the response of free charge carriers has made it possible for the first time to determine the temperature dependences of their microscopic parameters, viz., concentration, effective mass, relaxation frequency and time, mobility, and plasma frequency. It is shown that the relaxation frequency decreases upon cooling from 300 K to the coherence temperature T * = 70 K for YbB12, which is mainly associated with the phonon mechanism of scattering of charge carriers. For cooling below the coherence temperature T * = 70 K, the temperature dependence of the relaxation frequency for charge carriers of the Fermi-liquid type is found to be γ ∼ γ0 + T 2, while their effective mass and relaxation time increase, respectively, to m *(20 K) = 34m 0 (m 0 is the free electron mass) and τ(20 K) = 4 × 10−13 s, indicating the establishment of coherent scattering of carriers from localized magnetic moments of the f centers. At a temperature of T = 5 K, the conductivity spectrum contains an absorption line at a frequency of 22 cm−1 (2.7 meV); the origin of this line can be associated with the exciton-polaron bound state. Since such a state was observed earlier in other intermediate-valence semiconductors (such as SmB6, TmSe1−x Te, and (Sm, Y)S), it is probably typical of this class of compounds.
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- 2006
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12. Emergent photovoltage on SmB6 surface upon bulk-gap evolution revealed by pump-and-probe photoemission spectroscopy
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Y, Ishida, T, Otsu, T, Shimada, M, Okawa, Y, Kobayashi, F, Iga, T, Takabatake, Y, Takabatake, and S, Shin
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Condensed Matter - Materials Science ,Multidisciplinary ,Materials science ,Condensed matter physics ,Strongly Correlated Electrons (cond-mat.str-el) ,Photoemission spectroscopy ,Surface photovoltage ,Kondo insulator ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences ,Photovoltaic effect ,Corrigenda ,Article ,Metal ,Condensed Matter - Strongly Correlated Electrons ,Band bending ,Topological insulator ,visual_art ,visual_art.visual_art_medium ,Ohm - Abstract
Recent studies suggest that an exemplary Kondo insulator SmB6 belongs to a new class of topological insulators (TIs), in which non-trivial spin-polarized metallic states emerge on surface upon the formation of Kondo hybridization gap in the bulk. Remarkably, the bulk resistivity reaches more than 20 Ohm cm at 4 K, making SmB6 a candidate for a so-called bulk-insulating TI. We here investigate optical-pulse responses of SmB6 by pump-and-probe photoemission spectroscopy. Surface photovoltage effect is observed below ~90 K. This indicates that an optically-active band bending region develops beneath the novel metallic surface upon the bulk-gap evolution. The photovoltaic effect persists for >200 microsec, which is long enough to be detected by electronics devices, and could be utilized for optical gating of the novel metallic surface.
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- 2015
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13. Effects of Annealing on the Physical Properties of Bi2Sr2CaCu2O8+∂
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Y. Yokoyama, Y. Nishihara, F. Iga, S. Arai, Keizo Murata, Dong Han Ha, and K. Ino
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Superconductivity ,Magnetization ,Materials science ,High-temperature superconductivity ,Flux pinning ,Condensed matter physics ,Hall effect ,law ,Annealing (metallurgy) ,Electrical resistivity and conductivity ,Transition temperature ,law.invention - Abstract
We present the measured resistivity, Hall coefficient, and magnetization for three kinds of Bi 2 Sr 2 CaCu 2 O 8+∂ ceramics subjected to various heat treatments. The Hall effect shows that in this system the carriers have hole-like characteristics. The hole density varies according to the heat treatment; the hole density increases and T c decreases as a result of oxidation. In spite of the atmosphere in which heat treatments were performed, the flux pinning density is increased by quenching. The Hall mobility is independent of the heat treatment of Bi 2 Sr 2 CaCu 2 O 8+∂ . This result indicates that oxygen atoms enter and leave sites on planes other than the CuO 2 planes in Bi 2 Sr 2 CaCu 2 O 8+∂ .
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- 1994
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14. A 600MHz MTJ-based nonvolatile latch making use of incubation time in MTJ switching
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Takahiro Hanyu, Yasuhiro Yoshida, Shinji Ikeda, F. Iga, Takeo Ohsawa, Shunsuke Fukami, Shuta Togashi, Hiroki Koike, Noboru Sakimura, Tetsuo Endoh, H. Ohno, and Naoki Kasai
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Engineering ,Hardware_MEMORYSTRUCTURES ,Magnetic logic ,business.industry ,Overhead (engineering) ,Electrical engineering ,Magnetic tunnelling ,Power (physics) ,Tunnel magnetoresistance ,CMOS ,Hardware_INTEGRATEDCIRCUITS ,Cmos logic circuits ,Hardware_ARITHMETICANDLOGICSTRUCTURES ,business ,Hardware_LOGICDESIGN ,Electronic circuit - Abstract
The incubation (transit) time of the perpendicular magnetic tunnel junction (MTJ) is found shorter (longer) than the in-plane MTJ. By making use of the incubation time, a new concept is proposed for MTJ/CMOS hybrid circuits that operate as fast as CMOS circuits without operation power overhead and with negligible MTJ switching error. A nonvolatile latch based on the concept is fabricated in 90nm technology to demonstrate 600MHz stable operation.
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- 2011
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15. Novel 2step Writing Method for STT-RAM to Improve Switching Probability and Write Speed
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F. Iga, Takeo Ohsawa, Takahiro Hanyu, Yusuke Suzuki, Tetsuo Endoh, Shinji Ikeda, and H. Ohno
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Materials science ,Electronic engineering - Published
- 2011
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16. Studies on Static Noise Margin and Scalability for Low-Power and High-Density Nonvolatile SRAM using Spin-Transfer-Torque (STT) MTJs
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Tetsuo Endoh, Takahiro Hanyu, F. Iga, Shinji Ikeda, H. Ohno, and Takeo Ohsawa
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Materials science ,business.industry ,Scalability ,Electrical engineering ,Spin-transfer torque ,High density ,Static noise margin ,Static random-access memory ,business ,Power (physics) - Published
- 2011
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17. Electronic Structure of Ce(Pd1-xCux)3(0≤x≤0.133) Studied by Photoemission and Bremsstrahlung Isochromat Spectroscopy
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Atsushi Fujimori, Susumu Ogawa, F. Iga, A. E. Bocquet, Mitsuo Kasaya, Shigemasa Suga, and Tadao Kasuya
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Materials science ,Bremsstrahlung ,Analytical chemistry ,General Physics and Astronomy ,Electronic structure ,medicine.disease_cause ,Spectral line ,X-ray photoelectron spectroscopy ,Impurity ,medicine ,Atomic physics ,Spectroscopy ,Anderson impurity model ,Ultraviolet - Abstract
We report on X-ray photoemission (XPS), Bremsstrahlung isochromat (BIS) and 4 f resonant ultraviolet photoemission (4 f RPES or UPS) spectroscopy of Ce(Pd 1- x Cu x ) 3 (0≤ x ≤0.133). With increasing x , the 4 f 1 BIS peak clearly observable in CePd 3 is strongly depressed, the 4 f 2 BIS peak is found to shift to lower energies and the intensity of the 3 d 9 4 f 0 component of the Ce 3d core XPS is found to become weaker. These experimental results are discussed in comparison with the spectra calculated by using the impurity Anderson model. It is found that lowering of the 4 f level energy e f along with reduction of the 4 f hybridization strength V with x can qualitatively reproduce the experimental result. It is also strongly suggested that the 4 f -4 f Coulomb energies are different for the 4 f BIS and 3 d XPS final states.
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- 1993
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18. Effects of Annealing on the Physical Properties of Bi2Sr2CaCu2O8+.DELTA
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Dong Han Ha, S. Arai, K. Ino, Y. Yokoyama, Keizo Murata, F. Iga, and Y. Nishihara
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Delta ,Flux pinning ,Materials science ,Condensed matter physics ,Annealing (metallurgy) ,education ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Magnetization ,Hall effect ,Electrical resistivity and conductivity ,visual_art ,visual_art.visual_art_medium ,Ceramic ,Electrical and Electronic Engineering ,Instrumentation ,psychological phenomena and processes - Abstract
We present the measured resistivity, Hall coefficient, and magnetization in three kinds of Bi2Sr2CaCu2O8+δ ceramics subjected to various heat treatments. The Hall effect shows that the carriers have the hole characteristic in this system. The hole number varies according to the heat treament. It increases and Tc decreases as a result of oxidation. In spite of the atmosphere of the heat treatment, the density of the flux pinning is increased by quenching. The Hall mobility is independent of the heat treatments for Bi2Sr2CaCu2O8+δ This result indicates that oxygens enter and leave sites on a plain other than the CuO2 plain in Bi2Sr2CaCu2O8+δ.
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- 1993
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19. The Performance of Magnetic Tunnel Junction Integrated on the Back-end Metal Line of CMOS Circuits
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Takahiro Hanyu, Jun Hayakawa, Tetsuo Endoh, Shinji Ikeda, Masashi Kamiyanagi, H. Hasegawa, Katsuya Miura, H. Ohno, and F. Iga
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Tunnel magnetoresistance ,Materials science ,CMOS ,business.industry ,Optoelectronics ,Nanotechnology ,business ,Line (electrical engineering) ,Electronic circuit - Published
- 2009
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20. Magnetoresistance and de Haas-van Alphen Effect in UB12
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Mitsuo Kasaya, Yoshichika Ōnuki, F. Iga, Yoshiko Kurosawa, Kazuhiko Satoh, Izuru Umehara, and Nobuyuki Nagai
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Physics ,Specific heat ,Magnetoresistance ,Condensed matter physics ,Cyclotron ,Fermi level ,General Physics and Astronomy ,Fermi surface ,De Haas–van Alphen effect ,law.invention ,symbols.namesake ,law ,Electrical resistivity and conductivity ,symbols - Abstract
We have measured the magnetoresistance and de Haas-van Alphen (dHvA) effect in UB 12 . Shown by the result of magnetoresistance, this material is a compensated metal, and possesses an open orbit along the direction. The detected dHvA branches are roughly explained by the recent band calculation performed by Harima et al . The cyclotron mass is in the range of 0.6 m 0 to 6 m 0 .
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- 1990
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21. Pressure Effect on Metal/Insulator Transition in Y1-xCaxTiO3
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T. Naka, F. Iga, Takehiko Matsumoto, and Y. Nishihara
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Condensed matter physics ,Chemistry ,General Chemistry ,Condensed Matter Physics ,Magnetic susceptibility ,Metal ,Residual resistivity ,Electrical resistivity and conductivity ,Phase (matter) ,visual_art ,Heavy fermion ,visual_art.visual_art_medium ,General Materials Science ,Kondo effect ,Metal–insulator transition - Abstract
The magnetic susceptibility and electrical resistivity in the metal-insulator (MI) transition of a mixed-valent Ti-oxide system, Y1-x CaxRTiO3, is investigated as a function of pressure. This system exhibits obviously the temperatureinduced MI transition at x=0. 3-0. 4. At the low temperature metallic phase, susceptibility, X (T), is strongly suppressed with pressure. On the other hand, in the high temperature semiconductiong phase X (T) obeying the Curie-Weiss law is not affected strongly with pressure. The coefficient of the T2-term in resistivity, A, and the residual resistivity, ρ (0), are decreases rapidly with pressure. At x=0. 375 and 0. 39, we recognize the relation of A∝X (10 K) 2 at the low temperature metallic state.
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- 1998
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22. Dynamics of the coherent ground state in intermediate-valentYbB12
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Martin Dressel, O. Ushakov, P. Haas, Boris Gorshunov, and F. Iga
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Physics ,Condensed matter physics ,Heavy fermion ,Dynamics (mechanics) ,Strongly correlated material ,Kondo effect ,Condensed Matter Physics ,Ground state ,Electronic, Optical and Magnetic Materials - Published
- 2006
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23. MAGNETIZATION AND MAGNETORESISTANCE MEASUREMENTS UP TO 60 T AT 70 mK
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Tatsuo C. Kobayashi, N Takamoto, T. Takabatake, F. Iga, Y. Narumi, S Hiura, Naoki Shimizu, M. Verdaguer, and K. Kindo
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Magnetization ,Materials science ,Magnetoresistance ,Condensed matter physics - Published
- 2004
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24. Study of strongly correlated electron alloy system Y1−xCaxTiO3
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T. Nishiguchi, Y. Nishihara, and F. Iga
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Materials science ,Magnetic moment ,Electronic correlation ,Condensed matter physics ,Alloy ,Electron ,engineering.material ,Condensed Matter Physics ,Magnetic susceptibility ,Titanate ,Electronic, Optical and Magnetic Materials ,Physical property ,Condensed Matter::Materials Science ,Electrical resistivity and conductivity ,engineering ,Condensed Matter::Strongly Correlated Electrons ,Electrical and Electronic Engineering - Abstract
The metal-insulator transition in the Y 1− x Ca x TiO 3 alloy system occurs about x = 0.35. Various physical property measurements suggest that this MI transition cannot be understood as a simple change in the carrier number in the Hubbard band. In this paper, detailed magnetic property and electrical resistivity behaviours around MI transition are discussed.
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- 1995
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25. The study of high field magnetization in the Kondo alloy system Lu1−xYbxB12
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Y. Kanamori, Mitsuo Kasaya, Muneyuki Date, Kazuhiko Sugiyama, and F. Iga
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Magnetization ,Materials science ,Condensed matter physics ,Band gap ,Alloy ,engineering ,High field ,Electrical and Electronic Engineering ,engineering.material ,Condensed Matter Physics ,Constant (mathematics) ,Magnetic susceptibility ,Electronic, Optical and Magnetic Materials - Abstract
The high field magnetization measurements in Lu1−xYbxB12 have been performed. In the dilute Yb region (0
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- 1994
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26. Paramagnetic Meissner Effect in Superconducting Single Crystals of Ba_{1-x}K_xBiO_3
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H. Minami, A. Iyo, H. T. Kirn, Hiromoto Uwe, J. W. Hodby, F. Iga, and W. Schmidbauer
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Superconductivity ,Materials science ,Field (physics) ,Condensed matter physics ,Magnetometer ,Condensed Matter - Superconductivity ,FOS: Physical sciences ,Superconducting magnet ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,law.invention ,Crystal ,Superconductivity (cond-mat.supr-con) ,Paramagnetism ,Meissner effect ,law ,Condensed Matter::Superconductivity ,General Materials Science ,Cuprate ,Physics::Atomic Physics - Abstract
The paramagnetic Meissner effect (PME) in the field cooled susceptibility has been observed in superconducting single crystals of Ba_{1-x}K_xBiO_3 using magnetometers of Quantum-Design Co.. The PME is similar to that observed in cuprates and Nb superconductors. For the Ba_{0.63}K_{0.37}BiO_3 crystal, the PME is observed in cooling process under the field up to 750 Oe. The PME was not found in the virgin-charged superconducting magnet. The PME is found in a superconductor with trapped flux and may arise from a remnant field, a temperature inhomogeneity near T_c, and a potassium-concentration inhomogeneity., Comment: 4 pages, 4 figures
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- 2002
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27. Transport properties under high pressure of the dense Kondo compounds CePdSn and YbB12
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Mitsuo Kasaya, Y. Okayama, Hiroki Takahashi, F. Iga, Nobuo Môri, and Hiroyuki Suzuki
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Metal ,Chemical substance ,Materials science ,Electrical resistance and conductance ,Condensed matter physics ,visual_art ,High pressure ,Hydrostatic pressure ,visual_art.visual_art_medium ,Electrical and Electronic Engineering ,Pressure dependence ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials - Abstract
We have measured the electrical resistance of the metallic dense Kondo compound CePdSn and the semiconducting dense Kondo compound YbB12 under hydrostatic pressure up to 80 kbar. The pressure dependence of the resistance and its implications for the pressure dependence of the gap energy is discussed.
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- 1993
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28. Acoustic de Haas-van Alphen effect in f-electron systems
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S. Sakatsume, Hideki Matsui, Yoshichika Ōnuki, R. Settai, Mitsuo Kasaya, T. Goto, Tadao Fujimura, Y. Ohe, and F. Iga
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Mass enhancement ,Physics ,geography ,Angular variation ,geography.geographical_feature_category ,Condensed matter physics ,Condensed Matter Physics ,Sound (geography) ,Electronic, Optical and Magnetic Materials - Abstract
The acoustic de Haas-van Alphen effects of CeCu 2 , YCu 2 and UB 12 have been observed by the sound velocity measurements. The angular variation of the frequencies and the mass enhancement effect are determined.
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- 1990
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29. Time-Resolved Switching Characteristic in Magnetic Tunnel Junction with Spin Transfer Torque Write Scheme
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Takahiro Hanyu, Yasuhiro Yoshida, Tetsuo Endoh, Shoji Ikeda, Hideo Ohno, and F. Iga
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Toy model ,Materials science ,Condensed matter physics ,Physics and Astronomy (miscellaneous) ,Spin-transfer torque ,General Engineering ,General Physics and Astronomy ,Nanosecond ,Pulse (physics) ,Tunnel magnetoresistance ,Nuclear magnetic resonance ,Sampling (signal processing) ,Waveform ,Voltage - Abstract
The time-resolved switching characteristics of 100×200 nm2 size CoFeB/MgO/CoFeB-based magnetic tunnel junction (MTJ) are investigated by using the 20 GHz sampling measurement technique. We focused on the physical quantities of the time-resolved characteristics such as incubation time t A, transit time t B, and the standard deviations σV's of the period of the switching waveform. Furthermore, the dependencies of t A and t B on the applied pulse waveforms are analyzed. We found t A exponentially decreases as the applied voltage to MTJ increases, while t B remains less than two nano seconds regardless of the applied voltage. Furthermore, it is observed that the standard deviations of the waveform during t A is larger than that of the other periods. Finally, we discuss the switching characteristics with proposed toy model based on spin transfer torque (STT) phenomena.
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- 2012
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30. High-Density and Low-Power Nonvolatile Static Random Access Memory Using Spin-Transfer-Torque Magnetic Tunnel Junction
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Takashi Ohsawa, Hideo Ohno, Tetsuo Endoh, Shoji Ikeda, Takahiro Hanyu, and F. Iga
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Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Transistor ,Spin-transfer torque ,General Engineering ,General Physics and Astronomy ,Dielectric ,Line (electrical engineering) ,Power (physics) ,law.invention ,Tunnel magnetoresistance ,law ,Optoelectronics ,Node (circuits) ,Static random-access memory ,business - Abstract
A novel nonvolatile static random access memory cell is proposed that consists of four transistors and two spin-transfer-torque magnetic tunnel junctions (STT-MTJs). In the case of the NFET driver cell, the free layers of the magnetic tunnel junctions are connected to the transistors' sources and drains to make the cell read-disturb free. The static power is totally eliminated as the power line is shut down during data hold. The static noise margin of the cell is calculated based on the experimental data on MTJ switching that is enhanced from the resistive load SRAM cell due to the MTJ's switching operation. The cell size is estimated to become smaller than the 6-transistor SRAM cell when it is designed at 45 nm node and beyond owing to the MTJ's area shrink as well as the thinning of its tunnel dielectrics (MgO).
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- 2012
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31. The Performance of Magnetic Tunnel Junction Integrated on the Back-End Metal Line of Complimentary Metal–Oxide–Semiconductor Circuits
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Katsuya Miura, Shoji Ikeda, F. Iga, Masashi Kamiyanagi, Haruhiro Hasegawa, Hideo Ohno, Jun Hayakawa, Tetsuo Endoh, and Takahiro Hanyu
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Materials science ,business.industry ,Transistor ,General Engineering ,General Physics and Astronomy ,Nanotechnology ,Hardware_PERFORMANCEANDRELIABILITY ,Line (electrical engineering) ,law.invention ,Tunnel magnetoresistance ,Oxide semiconductor ,CMOS ,Hardware_GENERAL ,law ,Logic gate ,Hardware_INTEGRATEDCIRCUITS ,Surface roughness ,Optoelectronics ,Hardware_ARITHMETICANDLOGICSTRUCTURES ,business ,Hardware_LOGICDESIGN ,Electronic circuit - Abstract
In this paper, we have described the complementary metal–oxide–semiconductor (CMOS)/magnetic tunnel junction (MTJ) integrated process technology; MTJs were fabricated on via metal with surface roughness of 0.3 nm with 0.14 µm CMOS process and 60 ×180 nm2 MTJ process. It is shown that by this process technology, the fabricated MTJ on CMOS logic circuit plane achieves a large change in a resistance of 3.63 kΩ (anti-parallel) with the TMR ratio of 138% at room temperature, which is large enough for a sensing scheme of standard CMOS logic. Furthermore, we have successfully demonstrated the DC and AC operation of this MTJ with write transistors. As the results, our MTJ achieves high enough write/read performance with transistors for realizing MTJ-based logic circuits.
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- 2010
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32. NMR of51V in CaVO3−y
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Y. Nakamura, Yoshikazu Nishihara, T. Machida, F. Iga, Hironori Nishihara, and S. Matsumoto
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Oxygen stoichiometry ,Materials science ,Condensed matter physics ,Analytical chemistry ,Oxide ,Knight shift ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Metal ,Paramagnetism ,symbols.namesake ,chemistry.chemical_compound ,Pauli exclusion principle ,chemistry ,visual_art ,symbols ,visual_art.visual_art_medium ,Electrical and Electronic Engineering ,Perovskite (structure) - Abstract
NMR experiments of51V are reported for a perovskite oxide CaVO3−y, whose electronic and magnetic properties are recently found to depend strongly on oxygen stoichiometry. A sharp free decay signal has been observed for a powdered sample of CaVO3.0 with a metallic Knight shift of K= 0.17 ± 0.02% and a Korringa value (T1T)−1 = 3.2 ± 0.5 (sK)−1 which confirms the material is a simple Pauli paramagnet without any appreciable importance of electron-electron correlation.
- Published
- 1994
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33. The metal-insulator transition in Y1−xCaxTiO3caused by structural phase separation
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Kenichi Kato, M. Tsubota, Toshihiro Nakano, F. Iga, Eiji Nishibori, Kazuyuki Uchihira, Makoto Sakata, Masaki Takata, and T. Takabatake
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Structural phase ,Materials science ,Structural Biology ,Separation (aeronautics) ,Analytical chemistry ,Metal–insulator transition ,Powder diffraction - Published
- 2002
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34. Risk profiles and one-year outcomes of patients with newly diagnosed atrial fibrillation in India: Insights from the GARFIELD-AF Registry
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Jitendra PS. Sawhney, Veerappa A. Kothiwale, Vikas Bisne, Rajashekhar Durgaprasad, Praveen Jadhav, Manoj Chopda, Velam Vanajakshamma, Ramdhan Meena, Govindan Vijayaraghavan, Kamaldeep Chawla, Jagan Allu, Karen S. Pieper, A. John Camm, Ajay K. Kakkar, Jean-Pierre Bassand, David A. Fitzmaurice, Samuel Z. Goldhaber, Shinya Goto, Sylvia Haas, Werner Hacke, Lorenzo G. Mantovani, Frank Misselwitz, Alexander G.G. Turpie, Martin van Eickels, Freek W.A. Verheugt, Gloria Kayani, Keith A.A. Fox, Bernard J. Gersh, Hector Lucas Luciardi, Harry Gibbs, Marianne Brodmann, Frank Cools, Antonio Carlos Pereira Barretto, Stuart J. Connolly, Alex Spyropoulos, John Eikelboom, Ramon Corbalan, Dayi Hu, Petr Jansky, Jørn Dalsgaard Nielsen, Hany Ragy, Pekka Raatikainen, Jean-Yves Le Heuzey, Harald Darius, Matyas Keltai, Sanjay Kakkar, Jitendra Pal Singh Sawhney, Giancarlo Agnelli, Giuseppe Ambrosio, Yukihiro Koretsune, Carlos Jerjes Sánchez Díaz, Hugo Ten Cate, Dan Atar, Janina Stepinska, Elizaveta Panchenko, Toon Wei Lim, Barry Jacobson, Seil Oh, Xavier Viñolas, Marten Rosenqvist, Jan Steffel, Pantep Angchaisuksiri, Ali Oto, Alex Parkhomenko, Wael Al Mahmeed, David Fitzmaurice, D.Y. Hu, K.N. Chen, Y.S. Zhao, H.Q. Zhang, J.Z. Chen, S.P. Cao, D.W. Wang, Y.J. Yang, W.H. Li, Y.H. Yin, G.Z. Tao, P. Yang, Y.M. Chen, S.H. He, Ying Wang, Yong Wang, G.S. Fu, X. Li, T.G. Wu, X.S. Cheng, X.W. Yan, R.P. Zhao, M.S. Chen, L.G. Xiong, P. Chen, Y. Jiao, Y. Guo, L. Xue, F.Z. Wang, H. Li, Z.M. Yang, C.L. Bai, J. Chen, J.Y. Chen, X. Chen, S. Feng, Q.H. Fu, X.J. Gao, W.N. Guo, R.H. He, X.A. He, X.S. Hu, X.F. Huang, B. Li, J. Li, L. Li, Y.H. Li, T.T. Liu, W.L. Liu, Y.Y. Liu, Z.C. Lu, X.L. Luo, T.Y. Ma, J.Q. Peng, X. Sheng, X.J. Shi, Y.H. Sun, G. Tian, K. Wang, L. Wang, R.N. Wu, Q. Xie, R.Y. Xu, J.S. Yang, L.L. Yang, Q. Yang, Y. Ye, H.Y. Yu, J.H. Yu, T. Yu, H. Zhai, Q. Zhan, G.S. Zhang, Q. Zhang, R. Zhang, Y. Zhang, W.Y. Zheng, B. Zhou, Z.H. Zhou, X.Y. Zhu, S. Kakkar, J.P.S. Sawhney, P. Jadhav, R. Durgaprasad, A.G. Ravi Shankar, R.K. Rajput, K. Bhargava, R. Sarma, A. Srinivas, D. Roy, U.M. Nagamalesh, M. Chopda, R. Kishore, G. Kulkarni, P. Chandwani, R.A. Pothiwala, M. Padinhare Purayil, S. Shah, K. Chawla, V.A. Kothiwale, B. Raghuraman, G. Vijayaraghavan, V.M. Vijan, G. Bantwal, V. Bisne, A. Khan, J.B. Gupta, S. Kumar, D. Jain, S. Abraham, D. Adak, A. Barai, H. Begum, P. Bhattacharjee, M. Dargude, D. Davies, B. Deshpande, P. Dhakrao, V. Dhyani, S. Duhan, M. Earath, A. Ganatra, S. Giradkar, V. Jain, R. Karthikeyan, L. Kasala, S. Kaur, S. Krishnappa, A. Lawande, B. Lokesh, N. Madarkar, R. Meena, P. More, D. Naik, K. Prashanth, M. Rao, N.M. Rao, N. Sadhu, D. Shah, M. Sharma, P. Shiva, S. Singhal, S. Suresh, V. Vanajakshamma, S.G. Panse, Y. Koretsune, S. Kanamori, K. Yamamoto, K. Kumagai, Y. Katsuda, K. Sadamatsu, F. Toyota, Y. Mizuno, I. Misumi, H. Noguchi, S. Ando, T. Suetsugu, M. Minamoto, Hiroshi Oda, K. Shiraishi, S. Adachi, K. Chiba, H. Norita, M. Tsuruta, T. Koyanagi, H. Ando, T. Higashi, K. Okada, S. Azakami, S. Komaki, K. Kumeda, T. Murayama, J. Matsumura, Y. Oba, R. Sonoda, K. Goto, K. Minoda, Y. Haraguchi, H. Suefuji, H. Miyagi, H. Kato, Tadashi Nakamura, Tsugihiro Nakamura, H. Nandate, R. Zaitsu, Yoshihisa Fujiura, A. Yoshimura, H. Numata, J. Ogawa, H. Tatematsu, Y. Kamogawa, K. Murakami, Y. Wakasa, M. Yamasawa, H. Maekawa, S. Abe, H. Kihara, S. Tsunoda, Katsumi Saito, Kazuyuki Saito, T. Fudo, K. Obunai, H. Tachibana, I. Oba, T. Kuwahata, S. Higa, M. Gushiken, T. Eto, H. Yoshida, D. Ikeda, Yoshitake Fujiura, M. Ishizawa, M. Nakatsuka, K. Murata, C. Ogurusu, M. Shimoyama, M. Akutsu, I. Takamura, F. Hoshino, N. Yokota, T. Iwao, K. Tsuchida, M. Takeuchi, Y. Hatori, Y. Kitami, Yoichi Nakamura, R. Oyama, M. Ageta, Hiroyuki Oda, Y. Go, K. Mishima, T. Unoki, S. Morii, Yuhei Shiga, H. Sumi, T. Nagatomo, K. Sanno, K. Fujisawa, Y. Atsuchi, T. Nagoshi, T. Seto, T. Tabuchi, M. Kameko, K. Nii, K. Oshiro, H. Takezawa, S. Nagano, N. Miyamoto, M. Iwaki, Yuichiro Nakamura, M. Fujii, M. Okawa, Masahiko Abe, Masatake Abe, Mitsunori Abe, T. Saito, T. Mito, K. Nagao, J. Minami, T. Mita, I. Sakuma, T. Taguchi, S. Marusaki, H. Doi, M. Tanaka, T. Fujito, M. Matsuta, T. Kusumoto, S. Kakinoki, K. Ashida, N. Yoshizawa, J. Agata, O. Arasaki, M. Manita, M. Ikemura, S. Fukuoka, H. Murakami, S. Matsukawa, Y. Hata, T. Taniguchi, T. Ko, H. Kubo, M. Imamaki, M. Akiyama, M. Inagaki, H. Odakura, T. Ueda, Y. Katsube, A. Nakata, H. Watanabe, M. Techigawara, M. Igarashi, K. Taga, T. Kimura, S. Tomimoto, M. Shibuya, M. Nakano, K. Ito, T. Seo, S. Hiramitsu, H. Hosokawa, M. Hoshiai, M. Hibino, K. Miyagawa, Hajime Horie, N. Sugishita, Yukio Shiga, A. Soma, K. Neya, Tetsuro Yoshida, Tomoki Yoshida, M. Mizuguchi, M. Ishiguro, T. Minagawa, M. Wada, H. Mukawa, F. Okuda, S. Nagasaka, Y. Abe, Sen Adachi, Susumu Adachi, T. Adachi, K. Akahane, T. Amano, K. Aoki, T. Aoyama, H. Arai, S. Arima, T. Arino, H. Asano, T. Asano, J. Azuma, T. Baba, T. Betsuyaku, H. Chibana, H. Date, J. Doiuchi, Y. Emura, M. Endo, Y. Fujii, R. Fujiki, A. Fujisawa, Y. Fujisawa, T. Fukuda, T. Fukui, N. Furukawa, T. Furukawa, W. Furumoto, T. Goto, M. Hamaoka, N. Hanazono, K. Hasegawa, T. Hatsuno, Y. Hayashi, K. Higuchi, K. Hirasawa, H. Hirayama, M. Hirose, S. Hirota, M. Honda, Hideki Horie, T. Ido, O. Iiji, H. Ikeda, K. Ikeda, K. Ikeoka, M. Imaizumi, H. Inaba, T. Inoue, F. Iseki, A. Ishihara, N. Ishioka, N. Ito, T. Iwase, H. Kakuda, J. Kamata, H. Kanai, H. Kanda, M. Kaneko, H. Kano, T. Kasai, T. Kato, Y. Kato, Y. Kawada, K. Kawai, K. Kawakami, S. Kawakami, T. Kawamoto, S. Kawano, J. Kim, T. Kira, H. Kitazawa, H. Kitazumi, T. Kito, T. Kobayashi, T. Koeda, J. Kojima, H. Komatsu, I. Komatsu, Y. Koshibu, T. Kotani, T. Kozuka, Y. Kumai, T. Kumazaki, I. Maeda, K. Maeda, Y. Maruyama, S. Matsui, K. Matsushita, Y. Matsuura, K. Mineoi, H. Mitsuhashi, N. Miura, S. Miyaguchi, S. Miyajima, H. Miyamoto, A. Miyashita, S. Miyata, I. Mizuguchi, A. Mizuno, T. Mori, O. Moriai, K. Morishita, O. Murai, Sho Nagai, Shunichi Nagai, E. Nagata, H. Nagata, A. Nakagomi, S. Nakahara, M. Nakamura, R. Nakamura, N. Nakanishi, T. Nakayama, R. Nakazato, T. Nanke, J. Nariyama, Y. Niijima, H. Niinuma, Y. Nishida, Y. Nishihata, K. Nishino, H. Nishioka, K. Nishizawa, I. Niwa, K. Nomura, S. Nomura, M. Nozoe, T. Ogawa, N. Ohara, M. Okada, K. Okamoto, H. Okita, M. Okuyama, H. Ono, T. Ono, Y. Onuki Pearce, S. Oriso, A. Ota, E. Otaki, Y. Saito, H. Sakai, N. Sakamoto, Y. Sakamoto, Y. Samejima, Y. Sasagawa, H. Sasaguri, A. Sasaki, T. Sasaki, Kazuki Sato, Kiyoharu Sato, M. Sawano, S. Seki, Y. Sekine, Y. Seta, K. Sezaki, N. Shibata, Y. Shiina, H. Shimono, Y. Shimoyama, T. Shindo, H. Shinohara, R. Shinohe, T. Shinozuka, T. Shirai, T. Shiraiwa, Y. Shozawa, T. Suga, C. Sugimoto, Kazuo Suzuki, Keita Suzuki, Shu Suzuki, Shunji Suzuki, Susumu Suzuki, Y. Suzuki, M. Tada, A. Taguchi, T. Takagi, Y. Takagi, K. Takahashi, S. Takahashi, H. Takai, C. Takanaka, S. Take, H. Takeda, K. Takei, K. Takenaka, T. Tana, G. Tanabe, K. Taya, H. Teragawa, S. Tohyo, S. Toru, Y. Tsuchiya, T. Tsuji, K. Tsuzaki, H. Uchiyama, O. Ueda, Y. Ueyama, N. Wakaki, T. Wakiyama, T. Washizuka, M. Watanabe, T. Yamada, T. Yamagishi, H. Yamaguchi, Kenichi Yamamoto, Kentaro Yamamoto, Kunihiko Yamamoto, T. Yamamoto, M. Yamaura, M. Yamazoe, K. Yasui, Y. Yokoyama, K. Yoshida, T.W. Lim, C.K. Ching, C.G. Foo, J.H. Chow, D.D. Chen, F.R. Jaufeerally, Y.M. Lee, G. Lim, W.T. Lim, S. Thng, S.Y. Yap, C. Yeo, S. Oh, H.N. Pak, J.-B. Kim, J.H. Kim, S.-W. Jang, D.H. Kim, D.R. Ryu, S.W. Park, D.-K. Kim, D.J. Choi, Y.S. Oh, M.-C. Cho, S.-H. Kim, H.-K. Jeon, D.-G. Shin, J.S. Park, H.K. Park, S.-J. Han, J.H. Sung, J.-G. Cho, G.-B. Nam, Y.K. On, H.E. Lim, J.J. Kwak, T.-J. Cha, T.J. Hong, S.H. Park, J.H. Yoon, N.-H. Kim, K.-S. Kim, B.C. Jung, G.-S. Hwang, C.-J. Kim, D.B. Kim, J.J. Ahn, H.J. An, H. Bae, A.L. Baek, W.J. Chi, E.A. Choi, E.H. Choi, H.K. Choi, H.S. Choi, S. Han, E.S. Heo, K.O. Her, S.W. Hwang, E.M. Jang, H.-S. Jang, S. Jang, H.-G. Jeon, S.R. Jeon, Y.R. Jeon, H.K. Jeong, I.-A. Jung, Hyeon Jeong Kim, Hyun Ju Kim, Ji Seon Kim, Jung Sook Kim, J.A. Kim, K.T. Kim, M.S. Kim, Sang Hee Kim, Sang Hyun Kim, Y.-I. Kim, C.S. Lee, E.H. Lee, G.H. Lee, H.Y. Lee, H.-Y. Lee, K.H. Lee, K.R. Lee, M.S. Lee, M.-Y. Lee, R.W. Lee, S.E. Lee, S.H. Lee, S. Lee, W.Y. Lee, I.K. Noh, A.R. Park, B.R. Park, H.N. Park, J.H. Park, M. Park, Y. Park, S.-Y. Seo, J. Shim, J.H. Sim, Y.M. Sohn, W.S. Son, Y.S. Son, H.J. Song, H.K. Wi, J.J. Woo, S. Ye, K.H. Yim, K.M. Yoo, E.J. Yoon, S.Y. Yun, P. Angchaisuksiri, S. Chawanadelert, P. Mongkolwongroj, K. Kanokphatcharakun, S. Cheewatanakornkul, T. Laksomya, S. Pattanaprichakul, T. Chantrarat, S. Rungaramsin, S. Silaruks, W. Wongcharoen, K. Siriwattana, K. Likittanasombat, P. Katekangplu, W. Boonyapisit, D. Cholsaringkarl, B. Chatlaong, P. Chattranukulchai, Y. Santanakorn, P. Hutayanon, P. Khunrong, T. Bunyapipat, S. Jai-Aue, P. Kaewsuwanna, P. Bamungpong, S. Gunaparn, S. Hongsuppinyo, R. Inphontan, R. Khattaroek, K. Khunkong, U. Kitmapawanont, C. Kongsin, B. Naratreekoon, S. Ninwaranon, J. Phangyota, A. Phrommintikul, P. Phunpinyosak, K. Pongmorakot, S. Poomiphol, N. Pornnimitthum, S. Pumprueg, S. Ratchasikaew, K. Sanit, K. Sawanyawisuth, B. Silaruks, R. Sirichai, A. Sriwichian, W. Suebjaksing, P. Sukklad, T. Suttana, A. Tangsirira, O. Thangpet, W. Tiyanon, Y. Vorasettakarnkij, T. Wisaratapong, W. Wongtheptien, A. Wutthimanop, S. Yawila, A. Oto, A. Altun, I. Ozdogru, K. Ozdemir, O. Yilmaz, A. Aydinlar, M.B. Yilmaz, E. Yeter, Z. Ongen, M. Cayli, H. Pekdemir, M. Ozdemir, M. Sucu, T. Sayin, M. Demir, H. Yorgun, M. Ersanli, E. Okuyan, D. Aras, H. Abdelrahman, O. Aktas, D. Alpay, F. Aras, M.F. Bireciklioglu, S. Budeyri, M. Buyukpapuc, S. Caliskan, M. Esen, M.A. Felekoglu, D. Genc, B. Ikitimur, E.B. Karaayvaz, S. Kılıç Karataş, S. Okutucu, E. Ozcelik, A. Quisi, H. Sag, L. Sahiner, B.Y. Sayin, T. Seker, D. Uzun Alkan, E. Yildirim, R. Yildirim, F. Yilmaz, V. Yuksekdag, H.L. Luciardi, N. Vensentini, A.C. Ingaramo, G.A. Sambadaro, V. Fernandez Caputi, S.G. Berman, P. Dragotto, A.J. Kleiban, N. Centurion, G. Giacomi, R.A. Ahuad Guerrero, D. Conde, G. Zapata, L.A. Di Paola, J.L. Ramos, R.D. Dran, J. Egido, A.A. Fernandez, M.J. Fosco, S. Sassone, V.A. Sinisi, L.R. Cartasegna, M.A. Berli, O.A. Gomez Vilamajo, F. Ferroni, E.D. Alaguibe, A. Alvarez D'Amelio, C. Arabetti, L. Arias, J.A. Belardi, L. Bergesio, F. Berli, M. Berli, S. Borchowiec, C. Buzzetti, R. Cabrini, V. Campisi, A.L. Cappi, R. Carrizo, F. Colombo Berra, J.P. Costabel, O.J.A. Costamagna, A.A. Damonte, I.N. De Urquiza, F. Diez, M.F. Edén, M. Fanuele, F. Fernandez Voena, M. Foa Torres, C. Funosas, M.P. Giacomi, C.H. Gimenez, E.P. Gurfinkel, M. de L.M. Had, V. Hansen, A.D. Hrabar, M. Ingratta, A. Lopez, G. Maehara, L. Maffei, A. Martinelli, C. Martinelli, J. Matkovich, B. Mautner, A. Meirino, R. Munguia, A. Navarro, V. Novas, G. Perez Prados, J. Pontoriero, R.N. Potito, C. Ricotti, M.A. Rodriguez, F. Rolandi, M.E. Said Palladino, M. Salinger, L.S. Sanziani, P.O. Schygiel, A. Sossich, J.F. Tinto, L. Tonelli, A.L. Tufare, M. Vallejo, M.E. Yunis, M. Zillo, F.J. Zurbrigk, A.C.P. Barretto, D.C. Sobral Filho, J. Jaber, D. Armaganijan, J. Faria Neto, A. Steffens, W. Kunz Sebba Barroso de Souza, J.D. de Souza Neto, J.M. Ribeiro, M. Silveira Teixeira, P.R. Ferreira Rossi, L. Pires, D. Moreira, J.C. Moura Jorge, A. Menezes Lorga Filho, L.C. Bodanese, M. Westerlund Montera, C.H. Del Carlo, T. Da Rocha Rodrigues, F.A. Alves da Costa, A. Lopes, R. Lopes, G.R. Araújo, E.R. Fernandes Manenti, J.F. Kerr Saraiva, J.C. Ferreira Braga, A. Negri, L. Souto, C. Moncada, D. Bertolim Precoma, F. Roquette, G. Reis, R.A. Ramos Filho, E. Lanna Figueiredo, R. Vieira Botelho, C. Munhoz da Fontoura Tavares, C.R. Costantini Frack, J. Abdalla Saad, H.C. Finimundi, C. Pisani, D. Chemello, M. Pereira Martins, C.C. Broilo França, F. Alban, G.B. Aranha Rosito, J.B. de Moura Xavier Moraes Junior, R.T. Tumelero, L. Nigro Maia, R. Simões de Almeida, N.C. do Carmo Borges, L.G. Gomes Ferreira, P. Agliardi, J. Alves de Oliveira Gomes, V. Araujo, M. Arruda Nakazone, T. Barbosa, S. Barroso, E. Belisario Falchetto, H. Bellotti Lopes, M.A. Benez Teixeira Lemos, G. Biazus, L. Borges Queiroz, F.E. Camazzola, M. Caporale, S. Cardoso Boscato, F. Chieza, M.O. Chokr, R. Clemente Mingireanov, N. Codonho Góes, C. Correa, M. Costa, C. Costantini Ortiz, L.S. da Silva, F. da Silva Paulitsch, J.A. da Silveira, E. Daros, G.R. de Araújo, M.I. Del Monaco, C. Dias, M.A. Dias, A.P. Drummond Wainstein, P. Ely Pizzato, D.C. Esteves, P. Fabri, T. Félix Lorenzato Fonseca, E. Fernandes, C. Fonseca, C.R. Frack Costantini, R. Franchin Ferraz, F. Freire, P. Gottardo, D. Guanaes, S. Guizzardi, E. Hettwer Magedanz, F. Igansi, F. Jannuzzi, G. Junior, D. Komar, E.G. Lino, D. Lopes, O. Lourenço da Silva Júnior, E. Lustosa, A.P. Macagnan, M.C. Marinho, M. Mazzoni, G. Melo, L. Mortari, O.M.C.C. Mouco, C. Nanzer Vital, C. Ormundo, S. Oss Emmer, E. Palmegiani, R. Pavani, L. Pereira, V.L. Pereira, R. Perreira, S. Poletti, S.C. Quaia Fortunato, C. Queirantes, N. Ramos Pereira, R.L. Rech, S. Ribeiro, A. Rodrigues, H. Roesch, T. Ruaro Reichert, D. Santos, I. Santos, M. Santos, M.V. Seroqui, S. Silva, L. Soares, L. Spolaor, C. Stoll, N. Toazza Duda, L. Trama, B. Unterkircher, M.V. Valois, T. Vargas, T. Viana, C. Vicente, L. Vidal Armaganijan, R. Vieira Homem, L.G. Vieira Torres, L. Vila Boas, F. Villaça Guimarães Filho, R. Corbalan, G. Eggers, C. Bugueño Gutiérrez, G. Arriagada, S. Potthoff Cardenas, B.A.J. Stockins Fernandez, C. Conejeros, C. Houzvic, P. Marin Cuevas, H. Montecinos, A. Forero, F. Lanas, M. Larico Gómez, G. Charme Vilches, C. Rey, C. Astudillo, J. Aguilar, Y. Campisto, C. Lara, E. Molina, J. Munoz Oyarzon, V. Olguin, M. Vergara, C. Villan, C.J. Sánchez Díaz, J. Illescas Diaz, R. Leal Cantú, M.G. Ramos Zavala, R. Cabrera Jardines, N. Espinola Zavaleta, S. Villarreal Umaña, E. López Rosas, G. Llamas Esperón, G. Pozas, E. Cardona Muñoz, N. Matadamas Hernández, A. Leyva Rendón, N. García Hernández, M. de los Ríos Ibarra, L. Virgen Carrillo, D. López Villezca, C. Hernández Herrera, J.J. López Prieto, R. Gaona Rodríguez, E. Villeda Espinosa, D. Flores Martínez, J. Velasco Barcena, R. Yong, I. Rodríguez Briones, J.L. Leiva Pons, H. Álvarez López, R. Olvera Ruiz, C. Díaz de la Vega, C. Cantú Brito, E. Chuquiure Valenzuela, R. Reyes-Sanchez, A. Bazzoni Ruiz, O. Nandayapa Flores, M. Benavides Gonzalez, R. Arriaga Nava, J.D. Morales Cerda, O. Fierro Fierro, P. Fajardo Campos, T.A.A. Alfaro, S. Altamirano Bellorin, R. 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Robiro Robiro, M. Roca, C. Roca Saumell, C. Rodrigo, E. Rodriguez, M. Rodriguez Garcia, S. Saez Jimenez, P. Sanchez Calderon, L. Sanchez Mendez, S. Sanchez Parra, C. Santolaya, M.R. Senan Sanz, A. Seoane Blanco, E. Serralvo, N. Sierra, C. Simon Valero, J. Sorribes Lopez, M. Teixido Fontanillas, M. Terns Riera, G. Tobajas, C. Torres, J. Torres Marques, M. Ubeda Pastor, M. Rosenqvist, A. Wirdby, J. Linden, K. Henriksson, M. Elmersson, A. Egilsson, U. Börjesson, G. Svärd, B. Liu, A. Lindh, L.-B. Olsson, M. Gustavsson, Lars Andersson, Lisbeth Andersson, L. Benson, C. Bothin, A. Hajimirsadeghi, K. Kadir, M. Ericsson, A. Ohlsson, H. Lindvall, P. Svensson, K. Thorne, H. Handel, P. Platonov, B. Eriksson, I. Timberg, K. Romberg, M. Crisby, J.-E. Karlsson, S.A. Jensen, A. Andersson, L. Malmqvist, B. Martinsson, F. Bernsten, J. Engdahl, J. Thulin, A. Hot-Bjelac, P. Stalby, H. Aaröe, E. Ahbeck, H. Ahlmark, F. Al-Khalili, G. Bonkowski, S. Dzeletovic, A.-B. Ekstrand, G.-B. Eriksson, K. Floren, C. Grässjö, S. Hahn, P. Jaensson, B. Jansson, J.-H. Jansson, R.-M. Kangert, A. Koch, D. Kusiak, A. Lettenström, A. Lindberg, C.-J. Lindholm, A. Mannermyr, K. Mansson, M. Millborg, C. Nilsson, A.-M. Ohlin, A. Olofsson, A. Osberg, A. Pedersen, K. Risbecker, K. Rosenberg, J. Samuelsson, M. Shayesteh, K. Skoglund, M. Stjernberg, C. Thorsen, J. Steffel, J.H. Beer, J. Debrunner, D. Amstutz, J. Bruegger, G. Elise, A. Grau, A. Guinand, I. Henriette, E. Saga, S. Winnik, A. Parkhomenko, I. Rudyk, V. Tseluyko, O. Karpenko, S. Zhurba, I. Kraiz, I. Kupnovytska, N. Serediuk, Y. Mostovoy, O. Ushakov, O. Koval, I. Kovalskyi, Y. Svyshchenko, O. Sychov, M. Stanislavchuk, O. Kraydashenko, A. Yagensky, S. Tykhonova, I. Fushtey, R. Belegai, G. Berko, L. Burdeuna, O. Chabanna, I. Daniuk, A. Ivanov, E. Kamenska, P. Kaplan, O. Khyzhnyak, S. Kizim, O. Matova, O. Medentseva, V. Mochonyi, M. Mospan, V. Nemtsova, T. Ovdiienko, O. Palamarchuk, M. Pavelko, R. Petrovskyy, D. Plevak, O. Proshak, S. Pyvovar, L. Rasputina, O. Romanenko, O. Romanova, A. Sapatyi, O. Shumakov, R. Stets, L. Todoriuk, V. Varenov, D. Fitzmaurice, N. Chauhan, D. Goodwin, P. Saunders, R. Evans, J. Leese, P.S. Jhittay, A. Ross, M.S. Kainth, G. Pickavance, J. McDonnell, A. Williams, T. Gooding, H. Wagner, S. Suryani, A. Singal, S. Sircar, R. Bilas, P. Hutchinson, A. Wakeman, M. Stokes, N. Paul, M. Aziz, C. Ramesh, P. Wilson, S. Franklin, S. Fairhead, J. Thompson, V. St Joseph, G. Taylor, D. Tragen, D. Seamark, C. Paul, M. Richardson, A. Jefferies, H. Sharp, H. Jones, C. Giles, M. Page, O. Oginni, J. Aldegather, S. Wetherwell, W. Lumb, P. Evans, F. Scouller, N. Macey, Y. Stipp, R. West, S. Thurston, P. Wadeson, J. Matthews, P. Pandya, A. Gallagher, T. Railton, B. Sinha, D. Russell, J.A. Davies, P. Ainsworth, C.P. Jones, P. Weeks, J. Eden, D. Kernick, W. Murdoch, L. Lumley, R.P. Patel, S.W. Wong, M. Saigol, K. Ladha, K. Douglas, D.F. Cumberlidge, C. Bradshaw, G. Van Zon, K.P. Jones, M.J. Thomas, E. Watson, B. Sarai, N. Ahmad, W. Willcock, J. Cairns, S. Sathananthan, N. de Kare-Silver, A. Gilliland, E. Strieder, A. Howitt, B. Vishwanathan, N. Bird, D. Gray, M. Clark, J. Bisatt, J. Litchfield, E. Fisher, T. Fooks, A.R. Kelsall, E. Alborough, J. Wakeling, M. Parfitt, K. Milne, S. Rogers, R. Priyadharshan, J.L. Oliver, E. Davies, S. Abushal, M. Jacobs, C. Hutton, N.I. Walls, R. Thompson, C. Chigbo, S.M.A. Zaidi, M. Howard, K.C. Butter, S. Barrow, H. Little, I.U. Haq, L. Gibbons, S. Glencross, A.J. McLeod, K. Poland, C. Mulholland, A. Warke, P. Conn, G. Burns, R.N. Smith, S. Lowe, R. Kamath, H.S. Dau, J. Webster, I. Hodgins, S. Vercoe, P.C. Roome, H. Pinnock, J.R.A. Patel, A. Ali, N. Hart, R. Davies, E. Stuart, C.A. Neden, M. Danielsen, R. Heath, P. Sharma, S. Galloway, C. Hawkins, R. Oliver, M. Aylward, S. Mannion, M. Braddick, D. Edwards, A.C. Rothwell, A. Sabir, F. Choudhary, S. Khalaque, A. Wilson, S. Peters, W. Coulson, N. Roberts, A. Heer, S. Coates, B. Ward, D. Jackson, S. Walton, D. Shepherd, M. Sterry, T. Wong, M. Boon, R. Bunney, R. Haria-Shah, R.T. Baron, S. Davies, T. Schatzberger, N. Hargreaves, T. Stephenson, H. Choi, R. Batson, L. Lucraft, T. Myhill, S. Estifano, D. Geatch, J. Wilkinson, R. Veale, K. Forshaw, T. Davies, K. Zaman, P. Vinson, C. Liley, M. Bandrapalli, P. McGinty, R. Wastling, P. McEleny, A. Beattie, P. Cooke, M. Wong, J. Gunasegaram, M. Pugsley, S. Ahmad, C. A'Court, J. Ayers, J. Bennett, S. Cartwright, S. Dobson, C. Dooldeniya, A. Flynn, R. Fox, J. Goram, A. Halpin, A. Hay, P. Jacobs, L. Jeffers, L. Lomax, I. Munro, R. Muvva, M. Nadaph, K. Powell, S. Randfield, D. Redpath, R. Reed, M. Rickenbach, G. Rogers, P.B. Saunders, C. Seamark, J. Shewring, P. Simmons, H. Simper, H. Stoddart, A. Sword, N. Thomas, A. Thomson, H. Gibbs, A. Blenkhorn, B. Singh, W. Van Gaal, W. Abhayaratna, R. Lehman, P. Roberts-Thomson, J. Kilian, D. Coulshed, A. Catanchin, D. Colquhoun, H. Kiat, D. Eccleston, J. French, L. Zimmett, B. Ayres, T. Phan, P. Blombery, D. Crimmins, D. O'Donnell, A. Choi, P. Astridge, M. Arstall, N. Jepson, M. Binnekamp, A. Lee, J. Rogers, G. Starmer, P. Carroll, J. Faunt, A. Aggarwala, L. Barry, C. Batta, R. Beveridge, A. Black, M. Bonner, J. Boys, E. Buckley, M. Campo, L. Carlton, A. Connelly, B. Conway, D. Cresp, H. Dimitri, S. Dixon, M. Dolman, M. Duroux, M. Eskandari, R. Eslick, A. Ferreira-Jardim, T. Fetahovic, D. Fitzpatrick, R. Geraghty, J. Gibbs, T. Grabek, M.H. Modi, K. Hayes, M.P. Hegde, L. Hesketh, B. Hoffmann, B. Jacobson, K. Johnson, C. Juergens, I. Kassam, V. Lawlor, M. Lehman, S. Lehman, D. Leung, S. Mackay, M. MacKenzie, C. McCarthy, C. McIntosh, L. McKeon, H. Morrison, C. Mussap, J.-D. Myers, V. Nagalingam, G. Oldfield, V. O'May, J. Palmer, L. Parsons, K. Patching, T. Patching, V. Paul, M. Plotz, S. Preston, H. Rashad, M. Ratcliffe, S. Raynes, J. Rose, L. Sanders, M. Seremetkoska, H. Setio, S. Shone, P. Shrestha, C. Singh, C. Singleton, N. Stoyanov, S. Sutcliffe, K. Swaraj, J. Tarrant, S. Thompson, I.M. Tsay, M. Vorster, A. Waldman, L. Wallis, E. Wilford, K. Wong, S.J. Connolly, A. Spyropoulos, J. Eikelboom, R. Luton, M. Gupta, A.S. Pandey, S. Cheung, R. Leader, P. Beaudry, F. Ayala-Paredes, J. Berlingieri, J. Heath, G. Poirier, M. Du Preez, R. Nadeau, G. Dresser, R. Dhillon, T. Hruczkowski, B. Schweitzer, B. Coutu, P. Angaran, P. MacDonald, S. Vizel, S. Fikry, R. Parkash, A. Lavoie, J. Cha, B. Ramjattan, J. Bonet, K. Ahmad, L. Aro, T. Aves, K. Beaudry, C. Bergeron, J. Bigcanoe, N. Bignell, L. Breakwell, E. Burke, L. Carroll, B. Clarke, T. Cleveland, S. Daheb, P. Dehghani, I. Denis, Z. Djaidani, P. Dorian, S. Douglass, J. Dunnigan, A. Ewert, D. Farquhar, A. Fearon, L. Ferleyko, D. Fournier, B. Fox, M.-C. Grenier, W. Gulliver, K. Haveman, C. Hines, K. Hines, A.M. Jackson, C. Jean, G. Jethoo, R. Kahlon, S. Kelly, R. Kim, V. Korley, J. Kornder, L. Kwan, J. Largy, C. Lewis, S. Lewis, I. Mangat, R. Moor, J. Navratil, I. Neas, J. Otis, R. Otis, M. Pandey, F. Petrie, A. Pinter, M. Raines, P. Roberts, M. Robinson, G. Sas, S. Schulman, L. Snell, S. Spearson, J. Stevenson, T. Trahey, S. Wong, D. Wright, H. Ragy, A. Abd El-Aziz, S.K. Abou Seif, M.G. El Din, S. El Etriby, A. Elbahry, A. El-Etreby, M. Elkhadem, A. Katta, T. Khairy, A. Mowafy, M. Nawar, A. Ohanissian, A. Reda, M. Reda, H. Salem, N. Sami, S. Samir, M. Setiha, M. Sobhy, A. Soliman, N. Taha, M. Tawfik, E. Zaatout, D. Kettles, J. Bayat, H. Siebert, A. Horak, Y. Kelfkens, R. Garda, T. Pillay, M. Guerra, L. van Zyl, H. Theron, A. Murray, R. Louw, D. Greyling, P. Mntla, V. Ueckermann, R. Loghdey, S. Ismail, F. Ahmed, J. Engelbrecht, A. Ramdass, S. Maharajh, W. Oosthuysen, G. Angel, C. Bester, M. Booysen, C. Boshoff, C. Cannon, S. Cassimjee, C. Chami, G. Conway, A. Davids, L. de Meyer, G. Du Plessis, T. Ellis, L. Henley, M. Karsten, E. Loyd, J. Marks, L. Mavhusa, M. Mostert, A. Page, L. Rikhotso, M. Salie, J. Sasto, F. Shaik, A. Skein, L. Smith, G. Tarr, T. Tau, F. van Zyl, W. Al Mahmeed, G. Yousef, A. Agrawal, M. Nathani, M. Ibrahim, E.M. Esheiba, R. Singh, A. Naguib, M. Abu-Mahfouz, M. Al Omairi, A. Al Naeemi, R. Maruthanayagam, N. Bazargani, A. Wassef, R. Gupta, M. Khan, B. Subbaraman, A. Abdul, A. Al Mulla, S. El Bardisy, P. Haridas, S. Jadhav, K. Magdaluyo, M. Makdad, I. Maqsood, R. Mohamed, N. Sharma, R. Sharma, M. Thanzeel, S.Z. Goldhaber, R. Canosa, P. Rama, E. Blumberg, J. Garcia, P. Mullen, V. Wilson, A. Quick, K. Ferrick, W.M. Kutayli, M. Cox, M. Franco, S. Falkowski, R. Mendelson, M. Williams, S. Miller, S. Beach, A. Alfieri, T. Gutowski, I. Haque, R. Reddy, W. Ahmed, P. Delafontaine, D. Diercks, D. Theodoro, K. Remmel, M. Alberts, R. Ison, H. Noveck, P. Duffy, S. Pitta, D. Nishijima, C. Treasure, N. Asafu-Adjaye, K. Ball, M. Bartlett, M. Bentley, S. Bowers, A. Brown, A. Browne, J. Cameron-Watts, M. Canova, D. Cassidy, K. Cervellione, S. Congal, J. DePauw, A. Dickerson, M. Eley, L. Evans, S. Felpel, K. Ferdinand, D. Fielder, P. Gentry, A. Haideri, F. Hakimi, T. Harbour, E. Hartranft, B. Hawkins, M. Headlee, L. Henson, C. Herrick, T. Hicks, S. Jasinski, A. Jones, L. Jones, P. Jones, S. Karl, M. Keeling, J. Kerr, P. Knowles, J. Langdon, M. Lay, J.A. Lee, T. Lincoln, E. Malone, A. Merliss, D. Merritt, J. Minardo, B. Mooso, C. Orosco, V. Palumbo, M. Parker, T. Parrott, S. Paserchia, G. Pearl, J. Peterson, N. Pickelsimer, T. Purcell, J. Raynor, S. Raziano, C. Richard, T. Richardson, C. Robertson, A. Sage, T. Sanghera, P. Shaw, J. Shoemaker, K. Smith, B. Stephanie, A. Thatcher, H. Theobald, N. Thompson, L. Treasure, T. Tripti, C. Verdi, and V. Worthy
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Surgery ,RD1-811 ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Background: The Global Anticoagulant Registry in the FIELD–Atrial Fibrillation (GARFIELD-AF) is an ongoing prospective noninterventional registry, which is providing important information on the baseline characteristics, treatment patterns, and 1-year outcomes in patients with newly diagnosed non-valvular atrial fibrillation (NVAF). This report describes data from Indian patients recruited in this registry. Methods and results: A total of 52,014 patients with newly diagnosed AF were enrolled globally; of these, 1388 patients were recruited from 26 sites within India (2012–2016). In India, the mean age was 65.8 years at diagnosis of NVAF. Hypertension was the most prevalent risk factor for AF, present in 68.5% of patients from India and in 76.3% of patients globally (P
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- 2018
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35. Magnetic and transport properties of uranium borides, UB12, UIr3B2 and UOs3B2
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K. Katoh, Tadao Kasuya, F. Iga, Mitsuo Kasaya, and Katsuhiko Takegahara
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Superconductivity ,Materials science ,Specific heat ,Condensed matter physics ,Analytical chemistry ,chemistry.chemical_element ,Uranium ,Condensed Matter Physics ,Magnetic susceptibility ,Osmium borides ,Electronic, Optical and Magnetic Materials ,Magnetic field ,chemistry.chemical_compound ,chemistry ,Electrical resistivity and conductivity ,Osmium Compounds - Abstract
From the magnetic susceptibility and specific heat measurements, it is found that UB 12 , UIr 3 B 2 and UOs 3 B 2 have no magnetic order down to 1.7 K. The observed specific heat coefficient γ is 20, 39 and 80 mJ/mol K 3 for UB 12 , UOs 3 B 2 and UIr 3 B 2 , respectively. Mass enhancement factor for UIr 3 B 2 is about 5.5.
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- 1990
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36. Susakiet al.Reply
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Takayuki Muro, Tomofumi Susaki, Takaaki Hanyu, Tsuneaki Miyahara, Takashi Mizokawa, Masaki Taniguchi, Mitsuo Kasaya, Akio Kimura, A. Fujimori, Hisatomo Harima, Akira Sekiyama, K. Kobayashi, Shigemasa Suga, M. Tsunekawa, Tomohiro Matsushita, F. Iga, Hiroyoshi Ishii, and H. Namatame
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Physics ,General Physics and Astronomy - Published
- 1997
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37. Kondo state in the alloy system Lu1−xYbxB12
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Mitsuo Kasaya, F. Iga, and Tadao Kasuya
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Lattice constant ,Valence (chemistry) ,Materials science ,Condensed matter physics ,Electrical resistivity and conductivity ,Alloy ,engineering ,engineering.material ,Condensed Matter Physics ,Magnetic susceptibility ,Electronic, Optical and Magnetic Materials - Abstract
Magnetic susceptibility and lattice parameter measurements indicate that Yb valence in Lu1−xYbxB12 is independent of x and about 2.9–3.0. Resistivity and Hall constant measurements reveal that this alloy system changes from a Kondo-like state to the SmB6-type mixed valence state with increasing x.
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- 1985
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38. Field-Induced Metallic State in YbB12under High Magnetic Field
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F. Iga, Muneyuki Date, Kiyohiro Sugiyama, Mitsuo Kasaya, and Tadao Kasuya
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Condensed Matter::Materials Science ,Magnetization ,Materials science ,Magnetoresistance ,Condensed matter physics ,Field (physics) ,Band gap ,General Physics and Astronomy ,Condensed Matter::Strongly Correlated Electrons ,Fermi energy ,Electron ,Thermal conduction ,Magnetic susceptibility - Abstract
High field magnetization and magnetoresistance of YbB 12 are investigated up to 550 kOe at low temperatures with special interest in the semiconductive band gap energy under the field. Very large negative magnetoresistance is found and the system is perfectly metallic around 500 kOe with anomalous increase in the magnetization. The experimental results are explained by introducing the model that the band gap produced by the mixing of the f- and conduction electrons is destroyed by applying the field and the released f-electron gives an anomalous magnetization. The g J -value is estimated as 1.9 for the f-level and this means that \(\varGamma_{8}\) may be most favourable for the responsible f-electron at the Fermi energy.
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- 1988
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39. Systematics of valence fluctuating states in f-electron systems
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Mitsuo Kasaya, F. Iga, Katsuhiko Takegahara, Norio Kobayashi, B. Liu, and Tadao Kasuya
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Samarium ,Cerium ,Valence (chemistry) ,Condensed matter physics ,Ferromagnetism ,Chemistry ,Kondo insulator ,General Engineering ,chemistry.chemical_element ,Kondo effect ,Electron ,Electronic band structure - Abstract
Results of our theoretical and experimental studies on the anomalous Kondo ferromagnet CeRh3B2 based on the f0 (lz = 0) band and the d0 screening of the 4f hole are shown. Gap formation in the unique compounds YbB12 and Ce(Pd1−xCux)3 is described by comparing with SmB6. Gap creation on the Kondo lattice is thereby established. Finally, a dense Kondo state in samarium compounds is shown in our recent experiments compared with that in cerium compounds.
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- 1987
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40. Mixed valence properties of YbB12
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Mitsuo Kasaya, Masashi Takigawa, Tadao Kasuya, and F. Iga
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Materials science ,Valence (chemistry) ,X-ray photoelectron spectroscopy ,Condensed matter physics ,Hall effect ,Electrical resistivity and conductivity ,Band gap ,Schottky diode ,Impurity effect ,Condensed Matter Physics ,Magnetic susceptibility ,Electronic, Optical and Magnetic Materials - Abstract
The magnetic susceptibility, electrical resistivity, Hall effect, NMR, XPS and specific heat measurements indicate that (1) YbB12 is a mixed valence compound with the valence of + 2.9, (2) as the temperature decreases χ goes through a pronounced peak at 75 K and then decreases rapidly to a constant value after subtraction of impurity effect, (3) the transport properties are very similar to those of SmB6, (4) 1/T1 obtained from 11B NMR shows a temperature dependence of activation type, (5) the magnetic specific heat is of Schottky type. These results suggest that YbB12 is a new mixed valence compound accompanied with the formation of an energy gap. Some of the experimental results are analysed by the model used in SmB6.
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- 1985
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41. Kondo effect in Sm1−Yb B6 and Tm1/2Yb1/2B6
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F. Iga, B. Liu, Mitsuo Kasaya, and Tadao Kasuya
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Crystal ,Physics ,Field (physics) ,Specific heat ,Condensed matter physics ,Kondo insulator ,Kondo effect ,Condensed Matter Physics ,Ground state ,Volume concentration ,Electronic, Optical and Magnetic Materials ,Ion - Abstract
The transport and specific heat measurements have indicated that (1) Sm 1− y Yb y B 6 shows Kondo effect in the low concentration range of Sm, (2) the ground state of the crystal field split J = 5 2 level of the Sm ion is a quartet Γ 8 , (3) Tm 1/2 Yb 1/2 B 6 also shows Kondo effect.
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- 1985
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42. Electrical resistivity, hall constant and magnetic susceptibility in the Kondo states Ce(Ni1−xPdx)Sn and YbNiSn
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F. Iga, Tadao Kasuya, T. Tani, and Mitsuo Kasaya
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Materials science ,Condensed matter physics ,Kondo insulator ,Alloy ,engineering.material ,Condensed Matter Physics ,Magnetic susceptibility ,Electronic, Optical and Magnetic Materials ,Ferromagnetism ,Electrical resistivity and conductivity ,Moment (physics) ,engineering ,Antiferromagnetism ,Kondo effect - Abstract
The compound CePdSn is found to be an antiferromagnet with a Neel poin of 7 K. Experimental results on the alloy system Ce ( Ni 1− x Pd x ) Sn revealed that the transport properties change from a semiconducting-like Kondo state to a metallic one with increase in x . YbNiSn is a new Kondo compound with a small ferromagnetic moment below 5.5 K.
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- 1988
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43. Specific heat measurements of YbB12 and YbxLu1−xB12
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F. Iga, Mitsuo Kasaya, and Tadao Kasuya
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Materials science ,Specific heat ,Condensed matter physics ,Band gap ,Lattice (order) ,Kondo insulator ,Direct and indirect band gaps ,Condensed Matter Physics ,Ground state ,Electronic, Optical and Magnetic Materials - Abstract
Specific heat measurements of YbB 12 have revealed that the band gap is formed on the Kondo lattice originated from the Γ 8 ground state. Increase of C / T of Yb x Lu 1− x B 12 in the low temperature region takes place in the concentration range larger than x ≈ 1 2 and its origin also is from 4f-band gap formation.
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- 1988
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44. XPS study of rare earth dodecaborides: TmB12, YbB12 and LuB12
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Takasi Sagawa, Mitsuo Kasaya, F. Iga, Y. Takakuwa, Tetsuo Takahashi, and Tadao Kasuya
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chemistry.chemical_classification ,Valence (chemistry) ,Rare earth ,Binding energy ,Analytical chemistry ,X-ray ,Valency ,General Chemistry ,Condensed Matter Physics ,Ion ,chemistry ,X-ray photoelectron spectroscopy ,Materials Chemistry ,Inorganic compound ,Nuclear chemistry - Abstract
Single phase TmB12, YbB12 and LuB12 were successfully obtained by the arc-melting and floating zone methods. The XPS measurements of these compounds have indicated that (1) only YbB12 is a valence fluctuating compound with the valency of +2.9 at room temperature, (2) the correlation energy between Yb2+ and Yb3+ ions is about 6.0 eV, (3) Tm and Lu ions in the dodecaborides are in a trivalent state, and (4) the binding energy of the 4f level in TmB12 and LuB12 is 5.0 and 7.7 eV, respectively.
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- 1984
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45. Magnetic and electric properties of YbB12 under high magnetic field
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A. Ohya, F. Iga, T. Kasuya, Muneyuki Date, M. Kasaya, and Kazuhiko Sugiyama
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Materials science ,Condensed matter physics ,Magnetic energy ,Band gap ,Demagnetizing field ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Condensed Matter::Materials Science ,Paramagnetism ,Magnetization ,Permeability (electromagnetism) ,Condensed Matter::Superconductivity ,Electric properties ,Condensed Matter::Strongly Correlated Electrons ,Magnetic pressure - Abstract
High magnetic field studies up to 550 kOe are done on the magnetic and electric properties of YbB12 at low temperatures with special interest in the band gap energy under the field. The gap is quenched around 200 kOe and a large magnetization appears above 450 kOe.
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- 1985
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46. Preparation and physical properties of rare earth hexaborides and dodecaborides
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F. Iga and M. Kasaya
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Superconductivity ,Materials science ,Condensed matter physics ,Magnetism ,Band gap ,Electrical resistivity and conductivity ,Hall effect ,Kondo effect ,Narrow-gap semiconductor ,Magnetic susceptibility - Abstract
The rare earth hexaborides and dodecaborides have been prepared using a floating zone technique.The rare earth hexaborides exhibit a variety of physical properties ranging from superconductor (YB6), to typical monovalent metal (LaB6), dense Kondo system (CeB6), valence fluctuating system (SmB6), anomalous magnetism based on the narrow gap semiconductor (EuB6), and nonmagnetic narrow gap semiconductor (YbB6).From the measurements of the magnetic susceptibility, electrical resistivity, Hall effect, NMR, XPS and specific heat measurement, it is found that YbB12 exhibits unique behavior uncharacteritic of hitherto studied ytterbium compounds; YbB12 is a mixed valent compound accompanied with the formation of an energy gap. LuB12 is a monovalent metal similar to LaB6.The rare earth hexaborides and dodecaborides have been prepared using a floating zone technique.The rare earth hexaborides exhibit a variety of physical properties ranging from superconductor (YB6), to typical monovalent metal (LaB6), dense Kondo system (CeB6), valence fluctuating system (SmB6), anomalous magnetism based on the narrow gap semiconductor (EuB6), and nonmagnetic narrow gap semiconductor (YbB6).From the measurements of the magnetic susceptibility, electrical resistivity, Hall effect, NMR, XPS and specific heat measurement, it is found that YbB12 exhibits unique behavior uncharacteritic of hitherto studied ytterbium compounds; YbB12 is a mixed valent compound accompanied with the formation of an energy gap. LuB12 is a monovalent metal similar to LaB6.
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- 1986
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47. A new and typical valence fluctuating system, YbB12
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F. Iga, K. Negishi, Tadao Kasuya, Mitsuo Kasaya, and S. Nakai
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Ytterbium ,Materials science ,Valence (chemistry) ,Condensed matter physics ,chemistry ,Hall effect ,Band gap ,Electrical resistivity and conductivity ,chemistry.chemical_element ,Condensed Matter Physics ,Magnetic susceptibility ,Electronic, Optical and Magnetic Materials - Abstract
Magnetic susceptibility, electrical resistivity, Hall effect and L III absorption measurements indicate that YbB 12 exhibits unique behavior uncharacteristic of hitherto studied ytterbium compounds. We suggest that YbB 12 is a valence fluctuating system accompanied with the formation of an energy gap.
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- 1983
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48. Susceptibility, LIII absorption and specific heat across the mixed valence range in R1−xLaxB6 and R1−yYbyB6(R=Tm, Sm)
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H. Yashima, Mitsuo Kasaya, M. Ohashi, F. Iga, S. Nakai, Takeo Satoh, and Tadao Kasuya
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Materials science ,Lattice constant ,Valence (chemistry) ,Specific heat ,Condensed matter physics ,Impurity ,Analytical chemistry ,Condensed Matter Physics ,Magnetic susceptibility ,Electronic, Optical and Magnetic Materials - Abstract
Magnetic susceptibility, L III absorption and lattice parameter measurements indicate that Tm valence changes from 3+ to mixed valence with decreasing y in Tm 1− y Yb y B 6 , whereas mixed valence seems to persist even to the single impurity limit in Tm 1− x La x B 6 . These results are compared with experimental one on Sm in the isomorphous alloys.
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- 1983
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49. Evidence for large thermodynamic signatures of in-gap fermionic quasiparticle states in a Kondo insulator.
- Author
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Yang Z, Marcenat C, Kim S, Imajo S, Kimata M, Nomura T, Muer A, Maude DK, Iga F, Klein T, Chowdhury D, and Kohama Y
- Abstract
The mixed-valence compound YbB
12 displays paradoxical quantum oscillations in electrical resistivity and magnetic torque in a regime with a well-developed insulating charge gap and in the absence of an electronic Fermi surface. However, signatures of such unusual fermionic quasiparticles in other bulk thermodynamic observables have been missing. Here we report the observation of a series of sharp double-peak features in the specific heat as a function of the magnetic field. The measured Hall resistivity evolves smoothly across the field values at which the characteristic anomalies appear in the thermodynamic response and rules out the possibility of conventional electrons as their origin. Our observations of thermodynamic anomalies in a bulk three-dimensional electrical insulator provide the evidence for the presence of emergent dispersing fermionic excitations within the insulating bulk, which sets the stage for further investigation of electron fractionalization in other correlated mixed-valence compounds., (© 2024. The Author(s).)- Published
- 2024
- Full Text
- View/download PDF
50. Detecting Magnetoelectric Effect in a Metallic Antiferromagnet via Nonreciprocal Rotation of Reflected Light.
- Author
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Arakawa K, Hayashida T, Kimura K, Misawa R, Nagai T, Miyamoto T, Okamoto H, Iga F, and Kimura T
- Abstract
Certain types of media breaking both space-inversion (P) and time-reversal (T) symmetries but preserving their combination PT exhibit the polarization rotation of reflected light even when that of transmitted light is prohibited. Such an effect is termed nonreciprocal rotation of reflected light (NRR). Although NRR shows nearly the same phenomenon as the magnetooptical Kerr effect or, equivalently, the Hall effect at optical frequencies, its origin is distinct and ascribed to a magnetoelectric (ME) effect at optical frequencies, i.e., the optical ME effect. Here we show the observation of NRR in a metallic antiferromagnet TbB_{4}. The result demonstrates that the ME effect in a metallic system, which is considered to be ill defined, can be detected using reflected light. Furthermore, we spatially resolve antiferromagnetic domains in TbB_{4} by microscope observations of NRR. Our work offers a unique way to probe the ME effect in metallic systems.
- Published
- 2023
- Full Text
- View/download PDF
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