Anomalous Isotope Effect in Rattling-Induced Superconductor
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概要
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To clarify that the Cooper pair in \beta-pyrochlore oxides is mediated by the anharmonic oscillation of a guest atom, i.e., rattling, we propose an experiment to detect an anomalous isotope effect. In the formula T_{\text{c}}\propto M^{-\eta}, where T_{\text{c}} is the superconducting transition temperature and M denotes the mass of the oscillator, it is found that the exponent \eta increases with the increase in anharmonicity of the potential for the guest atom. We predict that \eta becomes larger than 1/2 in rattling-induced superconductors, in sharp contrast to \eta=1/2 for weak-coupling superconductivity due to harmonic phonons and \eta<1/2 for strong-coupling superconductivity with the inclusion of the effect of Coulomb interaction.
- 2012-11-15
著者
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Hotta Takashi
Department Of Neurological Surgery Sapporo Medical College And Hospital
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Oshiba Kunihiro
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
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