Spin injection and relaxation in a mesoscopic superconductor

被引：68

作者：

Poli, N. ^{[1
]}

Morten, J. P. ^{[2
]}

Urech, M. ^{[1
]}

Brataas, Arne ^{[2
]}

Haviland, D. B. ^{[1
]}

Korenivski, V. ^{[1
]}

机构：

[1] Royal Inst Technol, S-10691 Stockholm, Sweden

[2] Norwegian Univ Sci & Technol, Dept Phys, N-7491 Trondheim, Norway

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.100.136601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study spin transport in a superconducting nanowire using a set of closely spaced magnetic tunnel contacts. We observe a giant enhancement of the spin accumulation of up to 5 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.

引用

页数：4

共 30 条

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