Structural and Magnetic Studies of Metal-Insulator Transition in Thiospinel CuIr_2S_4
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概要
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Crystal structure and magnetic susceptibility were investigated for a thiospinel compound CuIr_2S_4, which exhibits a transition from metallic to insulating on cooling at the transition temperature T_c of 230 K. It was found that the transition is accompanied by a first-order structural transition. As the compound is cooled through T_c, the structure transforms from cubic to tetragonal with a volume contraction of 0.7%. The tetragonal phase has an axial ratio of about 1.03. Magnetic susceptibility, which is paramagnetic in the metallic region, decreases sharply and becomes diamagnetic at T_c on cooling. The susceptibility is mostly temperature independent in each region above and below T_c. Magnetic measurements also revealed that high pressure stabilizes the insulating phase, in contrast with most of the compounds that exhibit metal-insulator transitions. Possible mechanisms of the metal-insulator transition are discussed.
- 社団法人日本物理学会の論文
- 1994-09-15
著者
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NAGATA Shoichi
Department of Materials Science and Engineering, Muroran Institute of Technology
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Nagata S
Muroran Inst. Technol. Hokkaido
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Nagata S
Muroran Inst. Technology Muroran
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Nagata S
Kumakoto Univ. Kumamoto Jpn
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Matsumoto T
Kyoto Univ. Kyoto
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Nagata Shoichi
Department Of Applied Material Science Muroran Institute Of Technology
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MATSUMOTO Takehiko
National Research Institute for Metals
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FURUBAYASHI Takao
National Institute for Materials Science
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Matsumoto T
National Research Institute For Metals
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Matsumoto T
Materials Engineering Laboratory National Institute Of Materials Science
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Matsumoto T
Institute For Solid State Physics The University Of Tokyo
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Matsumoto Takehiko
National Institute For Materials Science
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Hagino Takatsugu
Department of Materials Science and Engineering, Muroran Institute of Technology
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Hagino Takatsugu
Department Of Applied Materials Science Muroran Institute Of Technology
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Hagino Takatsugu
Department Of Materials Science And Engineering Muroran Institute Of Technology
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Furubayashi Takao
National Research Institute For Metals
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Matsumoto Takehiko
Institute For Solid State Physics The University Of Tokyo
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