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Enhanced spin-triplet pairing in magnetic junctions with s-wave superconductors

机译：带有s波超导体的磁性结中增强的自旋三重态对

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摘要

A common path to superconducting spintronics, Majorana fermions, and topologically protected quantum computing relies on spin-triplet superconductivity. While naturally occurring spin-triplet pairing is elusive, and even common spin-triplet candidates, such as Sr_2Ruo_4, support alternative explanations, proximity effects in heterostructures can overcome these limitations. It is expected that robust spin-triplet superconductivity in magnetic junctions should rely on highly spin-polarized magnets or complex magnetic multilayers. Instead, we predict that the interplay of interfacial spin-orbit coupling and the barrier strength in simple magnetic junctions, with only a small spin polarization and .s-wave superconductors, can lead to nearly complete spin-triplet superconducting proximity effects. This peculiar behavior arises from an effective perfect transparency: interfacial spin-orbit coupling counteracts the native potential barrier for states of a given spin and wave vector. We show that the enhanced spin-triplet regime is characterized by a huge increase in conductance magnetoanisotropy, orders of magnitude larger than in the normal state.
机译：超导自旋电子学，马里亚纳费米子和受拓扑保护的量子计算的通用路径依赖于自旋三重态超导。尽管自然发生的自旋三重态对难以捉摸，甚至普通的自旋三重态候选物（例如Sr_2Ruo_4）也支持替代解释，但异质结构中的邻近效应可以克服这些局限性。可以预料，磁性结中的自旋三重态超导性应该依赖于高度自旋极化的磁体或复杂的磁性多层。取而代之的是，我们预测界面自旋轨道耦合和简单磁性结中的势垒强度（只有很小的自旋极化和.s波超导体）之间的相互作用会导致自旋三重态超导接近效应完全消失。这种特殊的行为来自有效的完美透明性：界面自旋轨道耦合抵消了给定自旋和波矢量状态的固有势垒。我们表明，增强的自旋三重态的特征是电导磁各向异性大大增加，比正常状态大几个数量级。

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  • 来源
    《Physical review》 |2020年第1期|014515.1-014515.9|共9页
  • 作者

    Thomas Vezin; Chenghao Shen; Jong E. Han; Igor Zutic;

  • 作者单位

    Department of Physics University at Buffalo State University of New York Buffalo New York 14260 USA Laboratoire des Solides Irradies Ecole Polytechnique Universite Paris-Saclay F-91767 Palaiseau Cedex France;

    Department of Physics University at Buffalo State University of New York Buffalo New York 14260 USA;

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