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Observation of Thermoelectric Currents in High-Field Superconductor-Ferromagnet Tunnel Junctions
S Kolenda1, M J Wolf1, D Beckmann1
1Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Abstract:
We report on the experimental observation of spin-dependent thermoelectric currents in superconductor-ferromagnet tunnel junctions in high magnetic fields. The thermoelectric signals are due to a spin-dependent lifting of the particle-hole symmetry, and are found to be in excellent agreement with recent theoretical predictions. The maximum Seebeck coefficient inferred from the data is about -100 μV/K, much larger than commonly found in metallic structures. Our results directly prove the coupling of spin and heat transport in high-field superconductors.
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