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arXiv 0704.2358cond-mat.supr-concond-mat.mes-hall
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扩散SNS结中的态密度和超电流:非理想界面和自旋翻转散射的作用

Density of states and supercurrent in diffusive SNS junctions: role of nonideal interfaces and spin-flip scattering

J. C. Hammer, J. C. Cuevas, F. S. Bergeret, W. Belzig

摘要:

本文对扩散超导体-正常金属-超导体(SNS)结中的态密度和超导电流进行了理论研究。特别是,我们研究了这两个平衡性质的任意透明度的SN接口和自旋翻转散射的存在下,在正常的电线的影响。我们表明,存在于光谱中的扩散线的微型间隙是非常敏感的接口传输。更重要的是,我们表明,在任意的透明度的minigap取代的无源能源作为相关的能源规模的邻近效应,例如确定的临界电流的温度依赖性。我们还详细研究了如何抑制临界电流的自旋翻转散射,这可能是由于磁性杂质,或在某些情况下,外部磁场的影响。我们的分析基于准经典理论的扩散超导体可以是非常有价值的实验和理论之间的定量比较。

英文摘要:

We present a theoretical study of the density of states and supercurrent in diffusive superconductor-normal metal-superconductor (SNS) junctions. In particular, we study the influence on these two equilibrium properties of both an arbitrary transparency of the SN interfaces and the presence of spin-flip scattering in the normal wire. We show that the minigap that is present in the spectrum of the diffusive wire is very sensitive to the interface transmission. More mportantly, we show that at arbitrary transparency the minigap replaces the Thouless energy as the relevant energy scale for the proximity effect, determining for instance the temperature dependence of the critical current. We also study in detail how the critical current is suppressed by the effect of spin-flip scattering, which can be due to either magnetic impurities or, under certain circumstances, to an external magnetic field. Our analysis based on the quasiclassical theory of diffusive superconductors can be very valuable to establish quantitative comparisons between experiment and theory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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