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 by a large factor, and the thermoelectric figure of merit 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.
- Received 17 July 2013
DOI:https://doi.org/10.1103/PhysRevLett.112.057001
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