Universal Bound to the Amplitude of the Vortex Nernst Signal in Superconductors
Universal Bound to the Amplitude of the Vortex Nernst Signal in Superconductors
复制标题
超导体中涡旋能斯特信号振幅的普遍束缚
DOI：
10.1103/physrevlett.126.077001
复制
发表时间：
2021
影响因子：
8.6
通讯作者：
Behnia, Kamran
中科院分区：
文献类型：
--
作者：
Rischau, Carl Willem;Li, Yuke;Fauqué, Benoît;Inoue, Hisashi;Kim, Minu;Bell, Christopher;Hwang, Harold Y.;Kapitulnik, Aharon;Behnia, Kamran
超导涡旋的液体产生横向热电响应。由于超导波动，这个能斯特信号在正常状态下有一个很深的尾巴。在这里，我们提出了一个二维异质结构的铌掺杂钛酸锶（STO）和非晶钼锗的能斯特效应的研究。在临界温度以上由短暂的库珀对产生的能斯特信号具有STO中理论预期的幅度。另一方面，尽管临界温度和临界磁场的分布很大，但下面的涡旋能斯特信号的峰值幅度在这两种超导体和许多其他超导体中是相当的。在属于不同家族的四种超导体中，最大能斯特信号对应于每层的每涡旋熵。
A liquid of superconducting vortices generates a transverse thermoelectric response. This Nernst signal has a tail deep in the normal state due to superconducting fluctuations. Here, we present a study of the Nernst effect in two-dimensional heterostructures of Nb-doped strontium titanate (STO) and in amorphous MoGe. The Nernst signal generated by ephemeral Cooper pairs above the critical temperature has the magnitude expected by theory in STO. On the other hand, the peak amplitude of the vortex Nernst signal belowis comparable in both and in numerous other superconductors despite the large distribution of the critical temperature and the critical magnetic fields. In four superconductors belonging to different families, the maximum Nernst signal corresponds to an entropy per vortex per layer of.