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

Article

关键词: ROOM-TEMPERATURE;    BOUND-STATES;    FERROMAGNET;    MAGNETORESISTANCE;    SUPERCURRENTS;    NANOWIRE;    SR2RUO4;   

DOI  :  10.1103/PhysRevB.101.014515

来源: SCIE

【 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 Sr2RuO4, 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.

【 授权许可】

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