Specific Heat of the β-Pyrochlore Oxide Superconductors CsOs_2O_6 and RbOs_2O_6(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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Two β-pyrochlore oxide superconductors, CsOs_2O_6 and RbOs_2O_6, are studied thermodynamically by measuring specific heat on polycrystalline samples. It is found that a Sommerfeld coefficient γ is nearly equal, 20mJ/K^2 mol Os, in the two oxides with different superconducting transition temperatures; T_c=3.3 and 6.3K, respectively. This suggests that the density of states at the Fermi level is not a crucial parameter to determine the T_c of the β-pyrochlore oxide superconductors, which is incompatible with the general expectation for a conventional BCS-type superconductor. Anomalous lattice contributions to specific heat at low temperature are also reported, which may come from nearly localized phonon modes associated with the rattling of the alkali metal ions weakly bound in an oversized cage formed by OsO_6 octahedra.
- 社団法人日本物理学会の論文
- 2005-04-15
著者
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MURAOKA Yuji
Institute for Solid State Physics, University of Tokyo
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HIROI Zenji
Institute for Solid State Physics, University of Tokyo
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広井 善二
Institute For Solid State Physics University Of Tokyo
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Yamamura Jun-ichi
Institute For Solid State Physics University Of Tokyo
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Yamaura Junichi
Institute For Solid State Physics University Of Tokyo
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Yamaura J
Univ. Tokyo Chiba
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Yamaura Junichi
Materials Design And Characterization Laboratory Institute For Solid State Physics University Of Tok
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Yamaura J
Univ. Tokyo Chiba Jpn
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Yamaura J
Institute For Solid State Physics University Of Tokyo
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Hiroi Z
Institute For Solid State Physics University Of Tokyo
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Hiroi Zenji
Institute For Chemical Research Kyoto University
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Muraoka Y
Institute For Solid State Physics University Of Tokyo:(present Office)research Laboratory For Surfac
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Muraoka Yuji
Institute For Solid State Physics University Of Tokyo
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YONEZAWA Shigeki
Institute for Solid State Physics, University of Tokyo
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Yonezawa Shigeki
Institute For Solid State Physics University Of Tokyo
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Muramatsu Takaki
Institute For Solid State Physics University Of Tokyo
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Muraoka Y
Univ. Tokyo Chiba
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Yasuda Jun
Institute For Solid State Physics University Of Tokyo
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