Spatially inhomogeneous magnetic superconductors
Spatially inhomogeneous magnetic superconductors
复制标题
空间不均匀磁超导体
DOI：
10.1103/physrevb.104.l020508
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发表时间：
2021
影响因子：
3.7
通讯作者：
Levchenko, Alex
中科院分区：
文献类型：
--
作者：
Dzero, Maxim;Levchenko, Alex
本文研究了无序多带金属中自旋密度波序与超导共存的问题。据推测，在短的长度尺度上的无序势的随机变化，使电子之间的相互作用成为空间相关。因此，超导和磁序参数变得空间不均匀，并描述了普遍的唯象量，而所有的微观细节编码的耦合强度波动的相关函数。我们考虑一个最小模型，两个嵌套的二维费米面和无序势，其中包括带内和带间散射。该模型进行了分析，使用准经典的方法表明，短尺度的配对势无序导致的共存区域的扩大。
We consider a problem of superconductivity coexistence with the spin-density-wave order in disordered multiband metals. It is assumed that random variations of the disorder potential on short length scales render the interactions between electrons to become spatially correlated. As a consequence, both superconducting and magnetic order parameters become spatially inhomogeneous and are described by the universal phenomenological quantities, whereas all the microscopic details are encoded in the correlation function of the coupling strength fluctuations. We consider a minimal model with two nested two-dimensional Fermi surfaces and disorder potentials which include both intra- and interband scattering. The model is analyzed using the quasiclassical approach to show that short-scale pairing-potential disorder leads to a broadening of the coexistence region.