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Spin caloritronics with superconductors: Enhanced thermoelectric effects, generalized Onsager response-matrix, and thermal spin currents

Linder, Jacob; Bathen, Marianne Etzelmüller
Journal article
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URI
http://hdl.handle.net/11250/2465117
Date
2016
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  • Institutt for fysikk [1807]
  • Publikasjoner fra CRIStin - NTNU [20842]
Original version
Physical Review B. Condensed Matter and Materials Physics. 2016, 93 (22), .   10.1103/PhysRevB.93.224509
Abstract
It has recently been proposed and experimentally demonstrated that it is possible to generate large thermoelectric effects in ferromagnet/superconductor structures due to a spin-dependent particle-hole asymmetry. Here, we show theoretically that quasiparticle tunneling between two spin-split superconductors enhances the thermoelectric response manyfold compared to when only one such superconductor is used, generating Seebeck coefficients (S>1 mV/K) and figures of merit (ZT≃40) far exceeding the best bulk thermoelectric materials, and it also becomes more resilient toward inelastic-scattering processes. We present a generalized Onsager response-matrix that takes into account spin-dependent voltage and temperature gradients. Moreover, we show that thermally induced spin currents created in such junctions, even in the absence of a polarized tunneling barrier, also become largest in the case in which spin-dependent particle-hole asymmetry exists on both sides of the barrier. We determine how these thermal spin-currents can be tuned both in magnitude and sign by several parameters, including the external field, the temperature, and the superconducting phase difference.
Publisher
American Physical Society
Journal
Physical Review B. Condensed Matter and Materials Physics

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