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987 results on '"Kosuge, K."'

1. Spin Susceptibility and Superexchange Interaction in the Antiferromagnet CuO

Author

Shimizu, T., Matsumoto, T., Goto, A., Rao, T. V. Chandrasekhar, Yoshimura, K., and Kosuge, K.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Evidence for the quasi one-dimensional (1D) antiferromagnetism of CuO is presented in a framework of Heisenberg model. We have obtained an experimental absolute value of the paramagnetic spin susceptibility of CuO by subtracting the orbital susceptibility separately from the total susceptibility through the $^{63}$Cu NMR shift measurement, and compared directly with the theoretical predictions. The result is best described by a 1D $S=1/2$ antiferromagnetic Heisenberg (AFH) model, supporting the speculation invoked by earlier authors. We also present a semi-quantitative reason why CuO, seemingly of 3D structure, is unexpectedly a quasi 1D antiferromagnet., Comment: 7 pages including 4 tables and 9 figures

Published
2003
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2. Deviation from the Kadowaki-Woods relation in Yb-based intermediate-valent systems

Author

Tsujii, N., Yoshimura, K., and Kosuge, K.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

The T^2 coefficient of electrical resistivity, A, is compared with the electronic specific-heat coefficient, \gamma, for a number of Yb-based compounds. It is revealed that many systems including YbCuAl, YbInCu4, YbAl3 and YbCu5 show A/\gamma^2 values close to 0.4*10^{-6} \mu\Omega cm(mol K/mJ)^2, which is remarkably smaller than that known as the Kadowaki-Woods relation, A/\gamma^2 = 1.0*10^{-5} \mu\Omega cm(mol K/mJ)^2. Empirically, the compounds with the smaller A/\gamma^2 values appear to show weak intersite magnetic-correlation and/or to have almost fully-degenerated (J = 5/2 or 7/2) ground states., Comment: 13 pages, 3 figures, 1 table. To be published in J. Phys.: Condensed Matter

Published
2003
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3. High-field magnetization of the 3d heavy-fermion system LiV$_2$O$_{4-d}$ (d = 0, 0.08)

Author

Tsujii, N., Yoshimura, K., Kosuge, K., Mitamura, H., and Goto, T.

Subjects
Condensed Matter - Strongly Correlated Electrons
Abstract

Metamagnetic behavior has been observed in LiV2O4 powder sample around 38 T at 4.2 K. On the other hand, magnetization for oxygen deficient LiV2O3.92 shows no indication of metamagnetism up to 40 T, and shows substantially reduced magnetic moment compared to that of LiV2O4. These results suggest that ferromagnetic interaction is strongly enhanced by magnetic fields in LiV2O4, whereas antiferromagnetic interaction is dominant in LiV2O3.92., Comment: 9 pages, 3 figures, to be published in J. Phys.: Condens. Matter

Published
2002
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18. Contributor contact details

Author

Baudoin, Y., primary, Habib, M.K., additional, Doroftei, I., additional, Parra, C., additional, Otalora, C., additional, Forero, A., additional, Devy, M., additional, Santana, P., additional, Correia, L., additional, Barata, J., additional, Cepolina, E.E., additional, Zoppi, M., additional, Gradetsky, V.G., additional, Nomdedeu, L., additional, Sales, J., additional, Marin, R., additional, Cervera, E., additional, Saez, J., additional, Larionova, S., additional, de Almeida, A.T., additional, Marques, L., additional, Druyts, P., additional, Yvinec, Y., additional, Acheroy, M., additional, El-Qady, G., additional, Mohamed, A., additional, Metwaly, M., additional, Atya, M., additional, Gu, I.Y.H., additional, Tjahjadi, T., additional, Berrabah, S.A., additional, Fukuda, T., additional, Hasegawa, Y., additional, Kosuge, K., additional, Komoriya, K., additional, Kitagawa, F., additional, Ikegami, T., additional, Baudoin, Y., additional, Havlik, Š., additional, Armbrust, C., additional, Braun, T., additional, Fohst, T., additional, Proetzsch, M., additional, Renner, A., additional, Schafer, B.H., additional, Berns, K., additional, Kowalski, G., additional, Bedkowski, J., additional, Kowalski, P., additional, Maslowski, A., additional, Pajaziti, A., additional, Gojani, I., additional, Buza, Sh., additional, Shala, A., additional, Capi, G., additional, Abbas, A., additional, Cubber, G. De, additional, Doroftei, D., additional, Veshnikov, V.B., additional, Chashchukin, V.G., additional, Cayirpunar, O., additional, Gazi, V., additional, Tavli, B., additional, Witkowski, U., additional, Penders, J., additional, Herbrechtsmeier, S., additional, El-Habbal, M., additional, Defoort, M., additional, Floquet, T., additional, Kokosy, A., additional, Perruquetti, W., additional, Palos, J., additional, Atas, Y., additional, Burak Akat, S., additional, Alboul, L., additional, Delprato, U., additional, Cristaldi, M., additional, and Tusa, G., additional

Published
2011
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45. Thermoelectric properties of (Zn[sub 1-y]Mg[sub y])[sub 1-x]Al[sub x]O ceramics prepared by the polymerized complex method.

Author

Katsuyama, S., Takagi, Y., Ito, M., Majima, K., Nagai, H., Sakai, H., Yoshimura, K., and Kosuge, K.

Subjects
CERAMICS, ZINC compounds, THERMOELECTRICITY
Abstract

(Zn[sub 1-y]Mg[sub y])[sub 1-χ]Al[sub χ]O powders were synthesized by the polymerized complex method and then consolidated by spark plasma sintering apparatus. The microscopic structure and thermoelectric properties were examined comparing with the experimental results of the samples prepared by the conventional solid-state reaction method. A small amount of ZnAl[sub 2]O[sub 4] spinel phase as the second phase was observed in the sintered samples with x ≥ 0.02 by x-ray diffraction and a scanning electron microscope. The grain size of the samples prepared by the polymerized complex method is much smaller than that of the samples prepared by the conventional solid-state reaction method. The absolute values of the Seebeck coefficient and electrical resistivity decrease with increasing x up to about χ = 0.01, but above χ = 0.01 they are almost independent of χ. This result indicates that the solubility limit of Al in Zn[sub 1-χ]Al[sub χ]O is about χ = 0.01, which is also confirmed by [sup 27]Al nuclear magnetic resonance spectroscopy. At a fixed composition of χ, the absolute values of the Seebeck coefficient and electrical resistivity for the samples prepared by the polymerized complex method are smaller than those for the samples prepared by the solid-state reaction method, which indicates that the doping of the carrier into the material can be more easily realized in the samples prepared by the polymerized complex method. The thermal conductivity decreases with increasing χ, but the further suppression of the thermal conductivity was attained by the additional substitution on the Zn site by Mg. The Seebeck coefficient of (Zn[sub 1-y]Mg[sub y])[sub 1-χ]Al[sub χ]O is almost independent of Mg content y, but the electrical resistivity increases with increasing y. As a result, (Zn[sub 0.90]Mg[sub 0.10])[sub 0.9975]Al[sub 0.0025]O shows a maximum dimensionless figure of merit of 0.10 at 1073 K. [ABSTRACT FROM AUTHOR]

Published
2002
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