Enhancement of Andreev reflection by spin polarization in out-of-equilibrium ferromagnet-superconductor junctions

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dc.creatorBourgeois, O.
dc.creatorGandit, P.
dc.creatorLesueur, J.
dc.creatorMélin, R.
dc.creatorSulpice, A.
dc.creatorGrison, X.
dc.creatorChaussy, J.
dc.date1999-01-07
dc.date.accessioned2026-07-07T03:12:34Z
dc.date.available2026-07-07T03:12:34Z
dc.descriptionWe report on transport measurements on Nb/Al/Gd/Al/Nb junctions.Bulk Gadolinium is a weakly polarized ferromagnet (5-7%), and is present in the junction in granular form (superparamagnet). We show that Andreev reflection is strongly enhanced by a weak polarization, obtained by applying an external magnetic field. A new model is proposed that accounts for this effect. The transport is described in terms of ``hot'' carriers that experience Zeeman splitting due to the spin polarized background. The Landauer formula is $G=(4e^2)/h A(h_b)$, $h_b$ being the exchange field at the grain boundary, and A(E) the Andreev current coefficient, that increases with E for resistive junctions.
dc.description4 pages, 4 figures, RevTex
dc.identifierhttps://arxiv.org/abs/cond-mat/9901045
dc.identifierhttp://arxiv.org/abs/cond-mat/9901045
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28954
dc.subjectSuperconductivity
dc.titleEnhancement of Andreev reflection by spin polarization in out-of-equilibrium ferromagnet-superconductor junctions
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