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首页> 外文期刊>Physical review >Theory of superconductor-ferromagnet point-contact spectra: The case of strong spin polarization
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Theory of superconductor-ferromagnet point-contact spectra: The case of strong spin polarization

机译：超导体-铁磁体点接触光谱理论：强自旋极化的情况

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摘要

We study the impact of spin-active scattering on Andreev spectra of point contacts between superconductors (SC) and strongly spin-polarized ferromagnets (FM) using recently derived boundary conditions for the qua-siclassical theory of superconductivity. We describe the interface region by a microscopic model for the interface scattering matrix. Our model includes both spin filtering and spin mixing and is nonperturbative in both transmission and spin polarization. We emphasize the importance of spin-mixing caused by interface scattering, which has been shown to be crucial for the creation of exotic pairing correlations in such structures. We provide estimates for the magnitude of this effect in different scenarios and discuss its dependence on various physical parameters. Our main finding is that the shape of the interface potential has a tremendous impact on the magnitude of the spin-mixing effect. Thus, all previous calculations, being based on delta-function or box-shaped interface potentials, underestimate this effect gravely. As a consequence, we find that with realistic interface potentials the spin-mixing effect can easily be large enough to cause spin-polarized subgap Andreev bound states in SC/FM point contacts. In addition, we show that our theory generalizes earlier models based on the Blonder-Tinkham-Klapwijk approach.
机译：我们使用超导拟准经典理论的最新边界条件，研究了自旋散射对超导体（SC）与强自旋极化铁磁体（FM）之间的点接触的Andreev光谱的影响。我们通过微观模型描述了界面散射矩阵的界面区域。我们的模型既包括自旋滤波又包括自旋混合，并且在透射和自旋极化方面均无扰动。我们强调由界面散射引起的自旋混合的重要性，这已证明对于在此类结构中创建奇异配对相关至关重要。我们提供了在不同情况下这种影响的严重程度的估计，并讨论了其对各种物理参数的依赖性。我们的主要发现是界面电位的形状对自旋混合效应的大小有很大的影响。因此，以前所有基于增量函数或盒形界面电势的计算都严重低估了这种影响。结果，我们发现，在具有现实的界面电势的情况下，自旋混合效应很容易大到足以在SC / FM点触点中引起自旋极化的亚隙安德烈耶夫束缚态。此外，我们证明了我们的理论可以推广基于Blonder-Tinkham-Klapwijk方法的早期模型。

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