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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 48: Superconductivity: Heterostructures, Andreev Scattering, Proximity Effect, Vortices

TT 48.10: Talk

Friday, March 30, 2012, 12:00–12:15, H 2053

Nonlocal thermoelectric symmetry relations in ferromagnet-superconductor proximity structures — •Peter Machon1, Matthias Eschrig1,2, and Wolfgang Belzig11Department of Physics, University of Konstanz, D-78457 Konstanz, Germany — 2Department of Physics, Royal Holloway, University of London, Egham Hill, EGHAM, TW20 0EX, UK

The symmetries of thermal and electric transport coefficients in quantum coherent structures are related to fundamental thermodynamic principles by the Onsager reciprocity. We generalize Onsager's symmetry relation to nonlocal thermoelectric currents in a three terminal ferromagnet-superconductor heterostructur including spin-dependent crossed Andreev reflection and direct electron transfer processes. We proof this general symmetry by applying spin-dependent boundary conditions for quasiclassical Green's functions in both the clean and the dirty limit. We predict an anomalously large local thermopower and a nonlocal Seebeck effect, which can be explained by the spin-dependent spectral properties.

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