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arXiv 0707.2879cond-mat.mes-hallcond-mat.supr-con
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介观超导体中的自旋注入和弛豫

Spin injection and relaxation in a mesoscopic superconductor

N. Poli, J. P. Morten, M. Urech, Arne Brataas, D. B. Haviland, V. Korenivski

摘要:

我们研究了超导纳米线中的自旋积累和自旋弛豫。自旋注入和检测通过使用一组磁隧道接触电极,沿纳米线紧密间隔。我们观察到一个巨大的增强的自旋积累高达五个数量级的过渡到超导状态,符合预期的状态密度的变化。自旋弛豫长度从正常状态下的值减小了一个数量级。这些测量结合我们的理论模型,使我们能够区分个别自旋翻转机制中存在的传输通道。我们的结论是,磁性杂质,而不是自旋轨道耦合主导自旋翻转散射在超导状态。

英文摘要:

We study spin accumulation and spin relaxation in a superconducting nanowire. Spins are injected and detected by using a set of magnetic tunnel contact electrodes, closely spaced along the nanowire. We observe a giant enhancement of the spin accumulation of up to five orders of magnitude on transition into the superconducting state, consistent with the expected changes in the density of states. The spin relaxation length decreases by an order of magnitude from its value in the normal state. These measurements combined with our theoretical model, allow us to distinguish the individual spin flip mechanisms present in the transport channel. Our conclusion is that magnetic impurities rather than spin-orbit coupling dominate spin-flip scattering in the superconducting state.

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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