ANISOTROPIC IMPURITIES IN ANISOTROPIC SUPERCONDUCTORS
ANISOTROPIC IMPURITIES IN ANISOTROPIC SUPERCONDUCTORS
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各向异性超导体中的各向异性杂质
DOI：
10.1103/physrevb.60.13062
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发表时间：
1999
影响因子：
3.7
通讯作者：
O. Dolgov
中科院分区：
文献类型：
--
作者：
M. Kulić;O. Dolgov
各向异性超导体的物理性质，如临界温度和其他性质，敏感地依赖于电子平均自由程。对杂质散射的敏感性和由此产生的反常被认为是强各向异性配对的特征。这些反常现象通常用S波杂质散射来分析，这导致了普遍的偶破裂效应，它只依赖于两个散射参数，即平均自由程和杂质截面。我们研究了散射截面中各向异性的修正，发现不仅定量而且定性地偏离了普遍的S波各向同性对破裂。我们研究的性质包括转变温度、态密度、杂质处的准粒子束缚态以及杂质对磁通线的钉扎。
Physical properties of anisotropic superconductors like the critical temperature and others depend sensitively on the electron mean free path. The sensitivity to impurity scattering and the resulting anomalies are considered a characteristic feature of strongly anisotropic pairing. These anomalies are usually analyzed in terms of s-wave impurity scattering which leads to universal pair breaking effects depending on only two scattering parameters, the mean free path and the impurity cross section. We investigate here corrections coming from anisotropies in the scattering cross section, and find not only quantitative but also qualitative deviations from universal s-wave isotropic pairbreaking. The properties we study are the transition temperature, the density of states, quasiparticle bound states at impurities, and pinning of flux lines by impurities.