Enhanced spin accumulation in a superconductor

Details Enhanced spin accumulation in a superconductor Enhanced spin accumulation in a superconductor

2006-02-06

arxiv.org/abs/cond-mat/0602141v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures; accepted for publication in Journal of Applied Physics

Scientific paper

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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