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482 results on '"Struzhkin, Viktor"'

151. High-pressure study of silane to 150 GPa

Author

Strobel, Timothy A., primary, Goncharov, Alexander F., additional, Seagle, Christopher T., additional, Liu, Zhenxian, additional, Somayazulu, Maddury, additional, Struzhkin, Viktor V., additional, and Hemley, Russell J., additional

Published
2011
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164. Experimental determination of the elasticity of iron at high pressure

Author

Mao, Wendy L., primary, Struzhkin, Viktor V., additional, Baron, Alfred Q. R., additional, Tsutsui, Satoshi, additional, Tommaseo, Caterina E., additional, Wenk, Hans-Rudolf, additional, Hu, Michael Y., additional, Chow, Paul, additional, Sturhahn, Wolfgang, additional, Shu, Jinfu, additional, Hemley, Russell J., additional, Heinz, Dion L., additional, and Mao, Ho-Kwang, additional

Published
2008
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173. Crystal structure ofSiH4at high pressure

Author

Degtyareva, Olga, primary, Canales, Miguel Martínez, additional, Bergara, Aitor, additional, Chen, Xiao-Jia, additional, Song, Yang, additional, Struzhkin, Viktor V., additional, Mao, Ho-kwang, additional, and Hemley, Russell J., additional

Published
2007
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176. Origin of colossal magnetoresistance in LaMnO3 manganite.

Author

Baldini, Maria, Muramatsu, Takaki, Sherafati, Mohammad, Ho-kwang Mao, Malavasi, Lorenzo, Postorinog, Paolo, Satpathy, Sashi, and Struzhkin, Viktor V.

Subjects
PHASE separation, MANGANITE, COLOSSAL magnetoresistance, PERCOLATION, HAMILTON'S equations
Abstract

Phase separation is a crucial ingredient of the physics ofmanganites; however, the role of mixed phases in the development of the colossal magnetoresistance (CMR) phenomenon still needs to be clarified. We report the realization of CMR in a single-valent LaMnO3 manganite. We found that the insulator-to-metal transition at 32 GPa is well described using the percolation theory. Pressure induces phase separation, and the CMR takes place at the percolation threshold. A large memory effect is observed together with the CMR, suggesting the presence of magnetic clusters. The phase separation scenario is well reproduced, solving a model Hamiltonian. Our results demonstrate in a clean way that phase separation is at the origin of CMR in LaMnO3. [ABSTRACT FROM AUTHOR]

Published
2015
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177. New structure of high-pressure body-centered orthorhombic Fe2SiO4.

Author

Yamanaka, Takamitsu, Kyono, Atsushi, Nakamoto, Yuki, Kharlamova, Svetlana, Struzhkin, Viktor V., Gramsch, Stephen A., Mao, Ho-kwang, and Hemley, Russell J.

Subjects
HIGH pressure (Science), X-ray emission spectroscopy, SPIN crossover, MARTENSITIC transformations, SYNCHROTRONS
Abstract

A structural change in Fe2SiO4 spinel (ringwoodite) has been found by synchrotron powder diffraction study and the structure of a new high-pressure phase was determined by Monte-Carlo simulation method and Rietveld profile fitting of X-ray diffraction data up to 64 GPa at ambient temperature. A transition from the cubic spinel structure to a body centered orthorhombic phase (I-Fe2SiO4) with space group Imma and Z = 4 was observed at approximately 34 GPa. The structure of I-Fe2SiO4 has two crystallographically independent FeO6 octahedra. Iron resides in two different sites of sixfold coordination: Fe1 and Fe2, which are arranged in layers parallel to (101) and (011) and are very similar to the layers of FeO6 octahedra in the spinel structure. Silicon is located in the sixfold coordination in I-Fe2SiO4. The transformation to the new high-pressure phase is reversible under decompression at ambient temperature. A martensitic transformation of each slab of the spinel structure with translation vector generates the I-Fe2SiO4 structure. Laser heating of I-Fe2SiO4 at 1500 K results in a decomposition of the material to rhombohedral FeO and SiO2 stishovite. FeKβ X-ray emission measurements at high pressure up to 65 GPa show that the transition from a high spin (HS) to an intermediate spin (IS) state begins at 17 GPa in the spinel phase. The IS electron spin state is gradually enhanced with pressure. The Fe2+ ion at the octahedral site changes the ion radius under compression at the low spin, which results in the changes of the lattice parameter and the deformation of the octahedra of the spinel structure. The compression curve of the lattice parameter of the spinel is discontinuous at ~20 GPa. The spin transition induces an isostructural change. [ABSTRACT FROM AUTHOR]

Published
2015
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185. Hard superconducting nitrides

Author

Chen, Xiao-Jia, primary, Struzhkin, Viktor V., additional, Wu, Zhigang, additional, Somayazulu, Maddury, additional, Qian, Jiang, additional, Kung, Simon, additional, Christensen, Axel Nørlund, additional, Zhao, Yusheng, additional, Cohen, Ronald E., additional, Mao, Ho-kwang, additional, and Hemley, Russell J., additional

Published
2005
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189. Electronic spin state of iron in lower mantle perovskite

Author

Li, Jie, primary, Struzhkin, Viktor V., additional, Mao, Ho-kwang, additional, Shu, Jinfu, additional, Hemley, Russell J., additional, Fei, Yingwei, additional, Mysen, Bjorn, additional, Dera, Przemek, additional, Prakapenka, Vitali, additional, and Shen, Guoyin, additional

Published
2004
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198. Hydrogen Clusters in Clathrate Hydrate

Author

Mao, Wendy L., primary, Mao, Ho-kwang, additional, Goncharov, Alexander F., additional, Struzhkin, Viktor V., additional, Guo, Quanzhong, additional, Hu, Jingzhu, additional, Shu, Jinfu, additional, Hemley, Russell J., additional, Somayazulu, Maddury, additional, and Zhao, Yusheng, additional

Published
2002
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