Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 51: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 51.6: Talk

Wednesday, March 9, 2016, 16:15–16:30, H19

Observation of thermoelectric currents in high-field superconductor-ferromagnet tunnel junctions — •Stefan Kolenda, Michael J. Wolf, and Detlef Beckmann — Institut für Nanotechnologie, Karlsruher Institut für Technologie

We report on the experimental observation of thermoelectric currents in superconductor-ferromagnet tunnel junctions in high magnetic fields [1]. The thermoelectric signals are due to a spin-dependent lifting of particle-hole symmetry, and are found to be in excellent agreement with recent theoretical predictions [2]. The maximum Seebeck coefficient inferred from the data is about −100 µ V/K, much larger than commonly found in metalic structures. Our results directly give proof of the coupling of spin and heat transport in high-field superconductors.
S.Kolenda et al., arXiv:1509.05568
A.Ozaeta et al., PRL 112, 057001 (2014)