Isomorphic Structural Transition in the $\beta$-Pyrochlore Oxide Superconductor KOs2O6
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概要
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A phase transition observed at $T_{\text{p}} = 7.65$ K in the $\beta$-pyrochlore oxide superconductor KOs2O6 is studied by means of heat capacity, 39K-NMR, and X-ray diffraction measurements using high-quality single crystals. We find evidence of an isomorphic structural transition at $T_{\text{p}}$ without the off-center freezing of the K ion even below $T_{\text{p}}$. It is possibly related to the rattling motion of the K ion in an oversized atomic cage.
- 2010-04-15
著者
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Yamaura Jun-ichi
Institute For Solid State Physics The University Of Tokyo
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Hiroi Zenji
Institute For Chemical Research Kyoto University
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Takigawa Masashi
Institute For Solid State Physics Iniversity Of Tokyo
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Yamaura Jun-ichi
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Yamamuro Osamu
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Hiroi Zenji
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Takigawa Masashi
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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