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arXiv cond-mat/0102012cond-mat.supr-con
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超导-铁磁结构中交换场对约瑟夫森电流的增强

Enhancement of the Josephson current by an exchange field in superconductor-ferromagnet structures

F. S. Bergeret, A. F. Volkov, K. B. Efetov

摘要:

本文计算了两个超导-铁磁体(S/F)双层膜间的直流约瑟夫森电流。结果表明,结中的临界约瑟夫森电流$I_{c}$强烈地依赖于双层膜有效交换场$h$的相对取向.我们发现,在反平行取向的情况下,$I_{c}$在低温下随着$h$的增加而增加,并且在零温度下当$h$等于超导能隙$Δ$时具有奇异性。这种惊人的行为与平行排列的磁矩对临界电流的抑制形成对比,是超导体和铁磁体之间相互作用的一种有趣的新效应。

英文摘要:

We calculate the dc Josephson current for two superconductor-ferromagnet (S/F) bilayers separated by a thin insulating film. It is demonstrated that the critical Josephson current $I_{c}$ in the junction strongly depends on the relative orientation of the effective exchange field $h$ of the bilayers. We found that in the case of an antiparallel orientation, $I_{c}$ increases at low temperatures with increasing $h$ and at zero temperature has a singularity when $h$ equals the superconducting gap $Δ$. This striking behavior contrasts suppression of the critical current by the magnetic moments aligned in parallel and is an interesting new effect of the interplay between superconductors and ferromagnets.

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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