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arXiv 1004.5124cond-mat.supr-con
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约瑟夫森结中自旋激活区引起的三重态超电流

Triplet supercurrent due to spin-active zones in a Josephson junction

Jacob Linder, Asle Sudbø

摘要:

最近的实验证明三重态超导在铁磁约瑟夫森结与铜$_2$ MnAl-Heusler障碍的动机,我们构建了一个理论模型占这一观察。在我们的模型中,产生三重态超电流的关键成分是\textit{spin-active zones},其特征在于有效的倾斜界面磁矩。利用数值解的准经典方程的超导自旋活动的边界条件,我们发现定性非常好的协议与实验观察到的超电流。进一步的实验影响的自旋活性区进行了讨论。

英文摘要:

Motivated by a recent experiment evidencing triplet superconductivity in a ferromagnetic Josephson junction with a Cu$_2$MnAl-Heusler barrier, we construct a theoretical model accounting for this observation. The key ingredients in our model which generate the triplet supercurrent are \textit{spin-active zones}, characterised by an effective canted interface magnetic moment. Using a numerical solution of the quasiclassical equations of superconductivity with spin-active boundary conditions, we find qualitatively very good agreement with the experimentally observed supercurrent. Further experimental implications of the spin-active zones are discussed.

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