Spin Injection and Relaxation in a Mesoscopic Superconductor

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

doi:10.1103/PhysRevLett.100.136601

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Spin Injection and Relaxation in a Mesoscopic Superconductor

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

DOI 10.1103/PhysRevLett.100.136601 · Physical Review Letters

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.6	Pressure not reported	unknown