Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 55: Poster Session: Superconductivity 2

TT 55.2: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3

Spin-Caloritronic Transport in Superconductor-Ferromagnet Tunnel Structures — •Ali Rezaei, Akashdeep Kamra, Peter Machon, and Wolfgang Belzig — Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

We investigate the effect of an exchange field and spin-flip scattering on the pair potential and the spin Seebeck coefficient of superconductor (S) - ferromagnet (F) hybrid structures using the Green’s function method. Such structures have been predicted to show giant charge Seebeck coefficient [1,2]. In the absence of spin-flip scattering, the pair potential of the S has been studied for different values of the exchange field. We show that the normal to S phase transition with decreasing temperature, changes character from second to first order above a certain value of exchange field. The density of states in energy, and spin Seebeck coefficient as a function of temperature have been computed for several values of spin-flip scattering time. We show that spin-flip scattering limits the enhancement in the spin Seebeck coefficient in realistic settings.

[1] P. Machon, M. Eschrig, and W. Belzig, Phys. Rev. Lett. 110, 047002 (2013)

[2] A. Ozaeta, P. Virtanen, F. S. Bergeret, and T. T. Heikkilä, Phys. Rev. Lett. 112, 057001 (2014)