Physics – Condensed Matter – Superconductivity
Scientific paper
2000-05-11
Phys. Rev. B 62, 9726 (2000).
Physics
Condensed Matter
Superconductivity
15 pages, 12 figures included, submitted to PRB
Scientific paper
10.1103/PhysRevB.62.9726
The electron transport though ferromagnetic metal-superconducting hybrid devices is considered in the non-equilibrium Green's function formalism in the quasiclassical approximation. Attention if focused on the limit in which the exchange splitting in the ferromagnet is much larger than the superconducting energy gap. Transport properties are then governed by an interplay between spin-accumulation close to the interface and Andreev reflection at the interface. We find that the resistance can either be enhanced or lowered in comparison to the normal case and can have a non-monotonic temperature and voltage dependence. In the non-linear voltage regime electron heating effects may govern the transport properties, leading to qualitative different behaviour than in the absence of heating effects. Recent experimental results on the effect of the superconductor on the conductance of the ferromagnet can be understood by our results for the energy-dependent interface resistance together with effects of spin- accumulation without invoking long range pairing correlations in the ferromagnet.
Bauer Gerrit E. W.
Belzig Wolfgang
Brataas Arne
Nazarov Yu. V.
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