title: Predicted very large thermoelectric effect in ferromagnet-superconductor junctions in the presence of a spin-splitting magnetic field.
abstract: We show that a huge thermoelectric effect can be observed by contacting a superconductor whose density of states is spin split by a Zeeman field with a ferromagnet with a nonzero polarization. The resulting thermopower exceeds kB/e by a large factor, and the thermoelectric figure of merit ZT can far exceed unity, leading to heat engine efficiencies close to the Carnot limit. We also show that spin-polarized currents can be generated in the superconductor by applying a temperature bias.
authors.affiliation: Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, Manuel de Lardizabal 5, E-20018 San Sebastián, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Ozaeta
authors.affiliation: Low Temperature Laboratory, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland.
authors.forename: P
authors.initials: P
authors.lastname: Virtanen
authors.affiliation: Centro de Física de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, Manuel de Lardizabal 5, E-20018 San Sebastián, Spain and Donostia International Physics Center (DIPC), Manuel de Lardizabal 5, E-20018 San Sebastián, Spain and Institut für Physik, Carl von Ossietzky Universität, D-26111 Oldenburg, Germany.
authors.forename: F S
authors.initials: FS
authors.lastname: Bergeret
authors.affiliation: Low Temperature Laboratory, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland and Nanoscience Center, Department of Physics, P.O. Box 35 (YFL), FI-40014 University of Jyväskylä, Jyväskylä, Finland.
authors.forename: T T
authors.initials: TT
authors.lastname: Heikkilä