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arXiv 1609.07578cond-mat.str-elcond-mat.supr-con
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有效双通道Kondo晶格中的质量不平衡超导电性

Mass-Imbalanced Superconductivity in Effective Two-Channel Kondo Lattice

Hiroaki Kusunose

摘要:

我们认为,质量不平衡超导性是在一个有效的双通道近藤晶格中实现的,其特征性质出现在电磁响应,如迈斯纳效应。从低能有效的双通道Kondo晶格模型出发,用两个平均场序参量分量自洽地近似该模型,结果表明,Meissner核的大小敏感地反映了两个分量的平衡,而热力学性质几乎不受平衡的影响.这种显著的行为可以通过库珀对中的一个伙伴的局部特性来理解,即质量不平衡的影响。我们简要地提到的相关性的压力下观察到的Pr 1-2-20系统的上临界场的巨大增强。

英文摘要:

We propose that mass-imbalanced superconductivity is realized in an effective two-channel Kondo lattice, and its characteristic property appears in electromagnetic responses such as the Meissner effect. Starting from an effective two-channel Kondo lattice model as a low-energy effective theory, and approximating it with two mean-field order parameter components in a self-consistent fashion, it is shown that the balance of the two components is sensitively reflected in the magnitude of the Meissner kernel, while thermodynamic properties are little affected by the balance. This remarkable behavior is understood by the localized character of one partner in the Cooper pair, namely, the effect of the mass imbalance. We briefly mention the relevance to the huge enhancement of the upper critical field under pressure observed in Pr 1-2-20 systems.

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