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arXiv 1303.2355cond-mat.mes-hall
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无序超导体在磁场中的涨落电导率

Fluctuation conductivity of disordered superconductors in magnetic fields

Brian Tarasinski, Georg Schwiete

摘要:

计算了外加磁场对无序超导体纵向电导率的涨落修正。只要磁场对电子自旋自由度的影响可以忽略不计,我们导出的解析表达式在温度-磁场相图的整个金属部分都是有效的。我们的计算是基于动力学方程的方法。对于超导薄膜和导线在平行磁场的特殊情况下,我们进行了详细的比较与以前得到的结果与图解微扰理论在虚时间形式主义。作为应用,我们研究了薄膜在倾斜磁场中的电导率波动,特别是在低温区。我们提出了一个详细的讨论的非单调的磁电阻现象,并发现它显示了一个显着的依赖于倾斜角。

英文摘要:

We calculate fluctuation corrections to the longitudinal conductivity of disordered superconductors subject to an external magnetic field. We derive analytic expressions that are valid in the entire metallic part of the temperature-magnetic field phase diagram as long as the effect of the magnetic field on the spin degrees of freedom of the electrons may be neglected. Our calculations are based on a kinetic equation approach. For the special case of superconducting films and wires in parallel magnetic fields we perform a detailed comparison with results that were previously obtained with diagrammatic perturbation theory in the imaginary time formalism. As an application, we study the fluctuation conductivity of films in tilted magnetic fields with a special focus on the low-temperature regime. We present a detailed discussion of the phenomenon of the non-monotonous magnetoresistance and find that it displays a pronounced dependence on the tilting angle.

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