Spin-resolved Andreev reflection in ferromagnet-superconductor junctions with Zeeman splitting
Centre de Recherches sur les Très Basses
Laboratoire concentionné avec l'Université Joseph
BP 166 X, 38042 Grenoble Cedex, France
Accepted: 18 May 2000
Andreev reflection in ferromagnet-superconductor junctions is derived in a regime in which Zeeman splitting dominates the response of the superconductor to an applied magnetic field. Spin-up and spin-down Andreev reflections are shown to be resolved as the voltage is increased. In the metallic limit, the transition from Andreev to quasiparticle transport in the spin-up channels has a non-trivial behavior when spin polarization increases. The conductance is asymmetric in a voltage reversal, which can be used as a new probe of spin polarization.
PACS: 74.80.Fp – Point contacts; SN and SNS junctions / 72.10.Bg – General formulation of transport theory
© EDP Sciences, 2000