Spin fluctuations and superconductivity in layered f-electron superlattices
Spin fluctuations and superconductivity in layered f-electron superlattices
复制标题
层状f电子超晶格中的自旋涨落和超导性
DOI：
10.1103/physrevb.92.035129
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发表时间：
2015
影响因子：
3.7
通讯作者：
Yasuhiro Tada and Robert Peters
中科院分区：
文献类型：
--
作者：
Y. Tada;S. Takayoshi;and S. Fujimoto;Yasuhiro Tada;Yasuhiro Tada and Robert Peters
本文在涨落交换近似下研究了层状电子超晶格的磁性和超导性质。我们表明，自旋波动，其特征在于在三维（3D）布里渊区的自旋磁化率的最大值，强烈抑制在电子超晶格。然而，由于电子的空间限制，有效的2D自旋涨落会增加。因此，在电子超晶格中，由这些自旋涨落介导的波超导电性的趋势可以强烈地增加。这与由常规波超导体组成的超晶格形成鲜明对比，其中超导性通常被抑制。
We investigate magnetic and superconducting properties of layered-electron superlattices within the fluctuation exchange approximation (FLEX). We show that spin fluctuations, which are characterized by the maximum value of the spin susceptibility in the three-dimensional (3D) Brillouin zone, are strongly suppressed in-electron superlattices. However, effective 2D spin fluctuations can be increased due to the spatial confinement of theelectrons. Therefore the tendency towards-wave superconductivity, mediated by these spin fluctuations, can be strongly increased in-electron superlattices. This is in sharp contrast to superlattices composed of conventional-wave superconductors, where superconductivity is generally suppressed.