Coherence peak effects in a superconductor induced by a thermal spin current are reported. We measured inverse spin Hall effects induced by spin injection from a ferrimagnetic insulator Y3Fe5O12 into a superconductor NbN using longitudinal spin Seebeck effects. In the vicinity of the superconducting transition temperature of the NbN, a large enhancement of the spin Seebeck voltage is observed, whose sign is opposite to that for the vortex Nernst effect, but is consistent with a calculation for a coherence peak effect in the superconductor NbN.
@article{arxiv.1801.07943,
title = {Spin-current coherence peak in superconductor/magnet junctions},
author = {Maki Umeda and Yuki Shiomi and Takashi Kikkawa and Tomohiko Niizeki and Jana Lustikova and Saburo Takahashi and Eiji Saitoh},
journal= {arXiv preprint arXiv:1801.07943},
year = {2018}
}