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

机译:三重态超电流归因于约瑟夫森结中的自旋活性区

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摘要

Motivated by a recent experiment evidencing triplet superconductivity in a ferromagnetic Josephson junction with a Cu_2MnAl-Heusler barrier, we construct a theoretical model accounting for this observation. The key ingredients in our model which generate the triplet supercurrent are spin-active zones, characterized 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.
机译:根据最近的实验证明,在具有Cu_2MnAl-Heusler势垒的铁磁约瑟夫逊结中三重态超导性,我们构建了一个理论模型来解释这一现象。我们模型中产生三重态超电流的关键因素是自旋活性区,其特征在于有效的倾斜界面磁矩。使用具有自旋活动边界条件的超导准经典方程的数值解,我们发现与实验观察到的超电流在质量上非常吻合。讨论了自旋活性区的其他实验意义。

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