Effects of surface roughness on the paramagnetic response of small unconventional superconductor
Effects of surface roughness on the paramagnetic response of small unconventional superconductor
复制标题
表面粗糙度对小型非常规超导体顺磁响应的影响
DOI：
10.1103/physrevb.91.214510
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发表时间：
2015
影响因子：
3.7
通讯作者：
Shu-Ichiro Suzuki and Yasuhiro Asano
中科院分区：
文献类型：
--
作者：
福間 洸平;ビシコフスキー アントン;林 慎吾;梶原 隆司;飯森 拓嗣;小森 文夫;田中 悟;Shu-Ichiro Suzuki and Yasuhiro Asano
通过自洽求解准经典绿色函数的Eilenberger方程和矢势的麦克斯韦方程，从理论上研究了表面粗糙度对小型非常规超导体磁响应的影响.自旋单重波超导盘的顺磁相位被表面粗糙度极大地抑制，而自旋三重波盘的顺磁相位即使在粗糙度的存在下也是鲁棒的。这种差异来自轨道对称的顺磁奇频库珀对出现在表面的磁盘。顺磁配对关联的轨道部分在波盘中具有波对称性，而在波盘中具有波对称性。通过计算自由能，我们也证实了顺磁态比正常态更稳定，这预示着在实验中探测顺磁效应的可能性。事实上，我们的结果是一致的高薄膜的实验发现。
We theoretically study the effects of surface roughness on the magnetic response of small unconventional superconductors by solving the Eilenberger equation for the quassiclassical Green function and the Maxwell equation for the vector potential simultaneously and self-consistently. The paramagnetic phase of spin-singlet-wave superconducting disks is greatly suppressed by the surface roughness, whereas that of spin-triplet-wave disks is robust even in the presence of the roughness. This difference derives from the orbital symmetry of paramagnetic odd-frequency Cooper pairs appearing at the surface of the disks. The orbital part of the paramagnetic pairing correlation has-wave symmetry in the-wave disks, whereas it has-wave symmetry in the-wave disks. Calculating the free energy, we also confirm that the paramagnetic state is more stable than the normal state, which indicates a possibility of detecting the paramagnetic effect in experiments. Indeed, our results are consistent with an experimental finding on high-thin films.