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arXiv 0907.0632cond-mat.supr-concond-mat.mes-hall
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长无序约瑟夫森结中的磁干涉图样

Magnetic interference patterns in long disordered Josephson junctions

B. Crouzy, D. A. Ivanov

摘要:

研究了外磁场中的扩散超导体-正常金属-超导体(SNS)结.在长结的极限情况下,我们发现约瑟夫森电流对场和结长的依赖关系的形式取决于与磁场有关的结宽和结长之比。这两种长度尺度之间的某一临界比率将两种不同的状态分开。在窄结中,临界电流表现出作为结长或磁场的函数的纯衰减。在宽结中,临界电流表现出阻尼振荡作为相同的参数的函数。这种阻尼振荡行为不同于典型的短结或隧道结的夫琅和费模式。在宽的和长的结中,超导对关联和超导电流沿着结的边缘局部化。

英文摘要:

We study a diffusive superconductor - normal metal - superconductor (SNS) junction in an external magnetic field. In the limit of a long junction, we find that the form of the dependence of the Josephson current on the field and on the length of the junction depends on the ratio between the junction width and the length associated with the magnetic field. A certain critical ratio between these two length scales separates two different regimes. In narrow junctions, the critical current exhibits a pure decay as a function of the junction length or of the magnetic field. In wide junctions, the critical current exhibits damped oscillations as a function of the same parameters. This damped oscillating behavior differs from the Fraunhofer pattern typical for short or tunnel junctions. In wide and long junctions, superconducting pair correlations and supercurrent are localized along the edges of the junction.

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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