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arXiv 1208.5871cond-mat.supr-concond-mat.str-el
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三重态超导-铁磁结中的自旋轨道耦合

Spin-orbital coupling in a triplet superconductor-ferromagnet junction

Paola Gentile, Mario Cuoco, Alfonso Romano, Canio Noce, Dirk Manske, P. M. R. Brydon

摘要:

我们研究了三重态超导体-铁磁体界面上自旋和轨道自由度之间的一种新型耦合。利用自洽的空间相关平均场论,我们证明了铁磁磁矩与三重态矢量序参量之间夹角的增大,会使界面附近的p波带隙增大或减小,这取决于带隙的波腹分别平行于或垂直于界面.凝聚能的相关变化为磁化建立了轨道相关的优选取向。当两个间隙分量都存在时,如在手征超导体中,我们观察到作为交换场强度的函数的不同矩取向之间的一阶跃迁。

英文摘要:

We study a novel type of coupling between spin and orbital degrees of freedom which appears at triplet superconductor-ferromagnet interfaces. Using a self-consistent spatially-dependent mean-field theory, we show that increasing the angle between the ferromagnetic moment and the triplet vector order parameter enhances or suppresses the p-wave gap close to the interface, according as the gap antinodes are parallel or perpendicular to the boundary, respectively. The associated change in condensation energy establishes an orbitally-dependent preferred orientation for the magnetization. When both gap components are present, as in a chiral superconductor, we observe a first-order transition between different moment orientations as a function of the exchange field strength.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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