Spin-current coherence peak in superconductor/magnet junctions
Spin-current coherence peak in superconductor/magnet junctions
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DOI：
10.1063/1.5027456
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发表时间：
2018-01
影响因子：
4
通讯作者：
Maki Umeda;Y. Shiomi;T. Kikkawa;T. Niizeki;J. Lustikova;S. Takahashi;E. Saitoh
中科院分区：
文献类型：
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作者：
Maki Umeda;Y. Shiomi;T. Kikkawa;T. Niizeki;J. Lustikova;S. Takahashi;E. Saitoh
本文报道了热自旋电流在超导体中引起的相干峰效应。利用纵向自旋Seebeck效应测量了铁磁绝缘体Y 3 Fe 5 O 12注入超导体NbN的自旋霍尔效应。在NbN的超导转变温度附近，观察到自旋Seebeck电压的大幅度增强，其符号与涡旋能斯特效应的符号相反，但与超导体NbN中相干峰效应的计算一致。
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 Y$_3$Fe$_5$O$_{12}$ 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.