Thermoelectric effects in superconductor-ferromagnet tunnel junctions on europium sulfide
Thermoelectric effects in superconductor-ferromagnet tunnel junctions on europium sulfide
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DOI：
10.1103/physrevb.95.224505
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发表时间：
2017-04
影响因子：
3.7
通讯作者：
S. Kolenda;C. Sürgers;G. Fischer;Detlef Beckmann
中科院分区：
文献类型：
--
作者：
S. Kolenda;C. Sürgers;G. Fischer;Detlef Beckmann
我们报道了在超导铁磁隧道结中与铁磁绝缘体硫化铕近距离接触的大热电效应。在这些系统中，自旋分裂场和自旋极化隧道电导的组合打破了电子-空穴对称性，并导致自旋相关的热电流。我们表明，由硫化铕引起的交换分裂在小的外加磁场中增强了热电效应，因此可以消除施加大磁场的需要，否则这可能会阻碍测温或冷却的应用。
We report on large thermoelectric effects in superconductor-ferromagnet tunnel junctions in proximity contact with the ferromagnetic insulator europium sulfide. The combination of a spin-splitting field and spin-polarized tunnel conductance in these systems breaks the electron-hole symmetry and leads to spin-dependent thermoelectric currents. We show that the exchange splitting induced by the europium sulfide boosts the thermoelectric effect in small applied fields and can therefore eliminate the need to apply large magnetic fields, which might otherwise impede applications in thermometry or cooling.