Pressure Effect on the Structure and Superconducting Transition Temperature of Filled Skutterudites LaT_{4}P
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概要
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We studied the effect of pressure on the superconducting transition temperature T_{\text{SC}} of LaT_{4}P<inf>12</inf>(T=\text{Fe}, Ru) up to 8 GPa through electrical resistivity measurements in a cubic anvil apparatus. The T_{\text{SC}} of LaFe<inf>4</inf>P<inf>12</inf>was also determined through magnetization measurements up to 3.4 GPa with an opposed-anvil pressure cell. In LaFe<inf>4</inf>P<inf>12</inf>, T_{\text{SC}} increases with pressure at a rate of 0.71 K/GPa from 0 GPa reaching its maximum at approximately 7 GPa. In contrast, the T_{\text{SC}} of LaRu<inf>4</inf>P<inf>12</inf>monotonically decreases with pressure. The decrease rate gradually increases from -0.07 to -0.29 K/GPa. The distinct pressure dependences of both T_{\text{SC}}'s cannot be explained solely from a structural point of view. We propose that the difference between the pressure dependence of T_{\text{SC}} for LaFe<inf>4</inf>P<inf>12</inf>and that for LaRu<inf>4</inf>P<inf>12</inf>can be attributed to the difference in the electronic density of states at the Fermi energy between these two compounds.
- 2013-11-15
著者
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Matsubayashi Kazuyuki
Institute For Solid State Physics The University Of Tokyo
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Sekine Chihiro
Muroran Institute Of Technology
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Gotou Hirotada
Institute For Solid State Physics The University Of Tokyo
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Hayashi Junichi
Muroran Institute of Technology
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Cheng Jinguang
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Uwatoko Yoshiya
Institute for Solid State Physics
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Kawamura Yukihiro
Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan
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Kawaai Takuma
Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan
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