Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 11: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Coexistence

TT 11.5: Vortrag

Dienstag, 28. März 2006, 10:30–10:45, HSZ 301

Influence of an inhomogeneous exchange field on the proximity effect in disordered superconductor-ferromagnet hybrid structures — •Thierry Champel, Tomas Lofwander, and Matthias Eschrig — Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe

We investigate the effect of an inhomogeneous exchange field on the proximity effect in superconductor-ferromagnet (S/F) hybrid structures within the quasiclassical theory of superconductivity. The superconducting proximity effect induces triplet correlations in the structure that are sensitive to the local quantization axis of the exchange field in the ferromagnet. As an example, we consider an in-plane spiral order in the ferromagnet. The coexistence of pair correlations results into a sensitivity of the superconducting transition temperature on the spatial variation of the exchange field in S/F bilayers. We show that the inhomogeneity also tends to suppress the oscillating behavior of the pair amplitudes in F. Finally we investigate the influence of the exchange field inhomogeneity on the π-state in SFS junctions.