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Spin-flip Enhanced Thermoelectricity in Superconductor-Ferromagnet Bilayers

Spin-flip Enhanced Thermoelectricity in Superconductor-Ferromagnet Bilayers

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REZAEI, Ali, Akashdeep KAMRA, Peter MACHON, Wolfgang BELZIG, 2018. Spin-flip Enhanced Thermoelectricity in Superconductor-Ferromagnet Bilayers. In: New Journal of Physics. 20, 073034. eISSN 1367-2630. Available under: doi: 10.1088/1367-2630/aad2a3

@article{Rezaei2018Spinf-40839.2, title={Spin-flip Enhanced Thermoelectricity in Superconductor-Ferromagnet Bilayers}, year={2018}, doi={10.1088/1367-2630/aad2a3}, volume={20}, journal={New Journal of Physics}, author={Rezaei, Ali and Kamra, Akashdeep and Machon, Peter and Belzig, Wolfgang}, note={Article Number: 073034} }

Attribution 3.0 Unported Kamra, Akashdeep Machon, Peter 2018-07-20T13:49:19Z 2018-07-20T13:49:19Z Machon, Peter 2018 Rezaei, Ali Rezaei, Ali Belzig, Wolfgang Belzig, Wolfgang eng Kamra, Akashdeep Spin-flip Enhanced Thermoelectricity in Superconductor-Ferromagnet Bilayers We study the effects of Zeeman-splitting and spin-flip scattering in a superconductor (S) on the thermoelectric properties of a tunneling contact to a metallic ferromagnet (F) using the Green's function method. A giant thermopower has been theoretically predicted and experimentally observed in such structures. This huge thermoelectric effect is attributed to the spin-dependent particle-hole asymmetry in the tunneling density of states in the S/F heterostructure. Here, we evaluate the S density of states and thermopower for a range of temperatures, Zeeman-splitting, and spin-flip scattering. In contrast to the naive expectation, we find that the spin-flip scattering strongly enhances the thermoelectric performance of the system in the low-field and low-temperature regime. This is attributed to a complex interplay between the charge and spin conductances caused by the softening of the spin-dependent superconducting gaps. The maximal value of the thermopower exceeds k<sub>B</sub>/e by a factor of ~ 5 and has a nonmonotonic dependence on Zeeman-splitting and spin-flip rate. We also demonstrate that the incoherent broadening leads to a drastic reduction of the thermoelectric performance.

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