Download Bobkov_Abstract

Family name: Bobkov
First name: Alexander
Institution: Institute of Solid State Physics, Chernogolovka, Russia
Status: Senior Researcher
Title and abstract of the poster presentation:
"Thermospin effects in superconducting heterostructures"
Large thermoelectric effect has been recently predicted [1,2] and observed
experimentally [3] by utilizing a N/F/S junction. The crucial thing is that the DOS in the
superconductor should be spin-split in order to observe the effect. Also it has been
predicted that N/(spin-split S) heterostructures admit thermally induced pure spin
current without requiring any polarization barrier [1,2,4].
Here the spin imbalance, which should be induced in mesoscopic heterostructures due
to this thermospin effect, is studied. We predict that in S/N heterostructures with a
temperature difference between N and S parts the spin imbalance results in the
appearance of superconductivity upon heating the sample or the enhancement of its
critical temperature.
We have also investigated the induced spin imbalance in S/N/S Josephson structures if
N interlayer is heated with respect to the superconductors. It is found that the spin
imbalance manifests itself in changing the frequency of 0- transitions in the system.
[1] P. Machon, M. Eschrig, and W. Belzig, PRL 110, 047002 (2013).
[2] A. Ozaeta, P. Virtanen, F.S. Bergeret, and T.T. Heikkila, PRL 112, 057001 (2014)
[3] S.Kolenda, M.J. Wolf, and D. Beckmann, PRL 116, 097001 (2016).
[4] J. Linder and M.E. Bathen, PRB 93, 224509 (2016)