Enhanced spin accumulation in superconductors

• A lateral array of ferromagnetic tunnel junctions is used to inject and detect nonequilibrium quasiparticle spin distribution in a superconducting strip made of Al. The strip width and thickness are kept below the quasiparticle spin diffusion length in Al. Nonlocal measurements in multiple parallel and antiparallel magnetic states of the detectors are used to in situ determine the quasiparticle 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 quasiparticle population by the opening of the gap below the transition temperature.

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

Nyckelord

Aluminum; Diffusion; Ferromagnetic materials; Quasicrystals; Superconducting transition temperature; Tunnel junctions; Antiparallel magnetic states; Quasiparticle population; Quasiparticle spin diffusion; Spin accumulation; Superconducting materials

Physics

Fysik

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