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Enhanced spin accumulation in a superconductor

M. Urech·J. Johansson·N. Poli·V. Korenivski·D. B. Haviland
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Abstract

A lateral array of ferromagnetic tunnel junctions is used to inject and detect non-equilibrium quasi-particle spin distribution in a superconducting strip made of Al. The strip width and thickness is kept below the quasi particle spin diffusion length in Al. Non-local measurements in multiple parallel and antiparallel magnetic states of the detectors are used to in-situ determine the quasi-particle spin diffusion length. A very large increase in the spin accumulation in the superconducting state compared to that in the normal state is observed and is attributed to a diminishing of the quasi-particle population by opening of the gap below the transition temperature.

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M. Urech, J. Johansson, N. Poli, V. Korenivski, D. B. Haviland. 2006-02-14. Enhanced spin accumulation in a superconductor. https://doi.org/10.1063/1.2176910

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