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Triplet proximity effect in superconducting heterostructures with a half-metallic layer

机译:具有半金属层的超导异质结构中的三重态邻近效应

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We present the Usadel theory describing the superconducting proximity effect in heterostructures with a half-metallic layer. It is shown that the full spin polarization inside the half-metals gives rise to an additional component of the Green's function which results in the giant triplet spin-valve effect in superconductor (S)-ferromagnet (F)-half-metal (HM) trilayers and provides a natural explanation for the φ_0-junction formation in the S/F/HM/F/S systems. In addition, we consider the exactly solvable model of the S/F/HM trilayers of atomic thickness and demonstrate that it reproduces the main features of the spin-valve effect found within the Usadel approach. Our results are shown to be in qualitative agreement with the recent experimental data on the spin-valve effect in MoGe/Ni/Cu/CrO_2 hybrids [Singh et al., Phys. Rev. X 5,021019 (2015)].
机译:我们提出了Usadel理论,该理论描述了具有半金属层的异质结构中的超导邻近效应。结果表明,半金属内部的完全自旋极化引起了格林函数的附加分量,这导致了超导体(S)-铁磁体(F)-半金属(HM)中巨大的三重态自旋阀效应。三层结构,并为S / F / HM / F / S系统中的φ_0结形成提供了自然的解释。此外,我们考虑了原子厚度S / F / HM三层的完全可解模型,并证明了该模型可重现Usadel方法中发现的自旋阀效应的主要特征。我们的结果显示与MoGe / Ni / Cu / CrO_2杂化体中自旋阀效应的最新实验数据在质量上吻合[Singh等,Phys。 X 5,021019(2015)。

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