Strong-Coupling Theory of Rattling-Induced Superconductivity
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概要
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In order to clarify the mechanism of the enhancement of superconducting transition temperature T_{\text{c}} due to anharmonic local oscillation of a guest ion in a cage composed of host atoms, i.e., rattling, we analyze the anharmonic Holstein model by applying the Migdal--Eliashberg theory. From the evaluation of the normal-state electron--phonon coupling constant, it is found that the strong coupling state is developed, when the bottom of a potential for the guest ion becomes wide and flat. Then, T_{\text{c}} is enhanced with the increase of the anharmonicity in the potential, although T_{\text{c}} is rather decreased when the potential becomes a double-well type due to very strong anharmonicity. From these results, we propose a scenario of anharmonicity-controlled strong-coupling tendency for superconductivity induced by rattling. We briefly discuss possible relevance of the present scenario with superconductivity in \beta-pyrochlore oxides.
- 2011-09-15
著者
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Hotta Takashi
Department Of Neurological Surgery Sapporo Medical College And Hospital
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Hotta Takashi
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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Oshiba Kunihiro
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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