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arXiv 2102.09425cond-mat.supr-concond-mat.str-el
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CeRh $_2$ As $_2$超导性的两种方案

Two scenarios for superconductivity in CeRh$_2$As$_2$

David Möckli, Aline Ramires

摘要:

CeRh $_2$ As $_2$是一种非对称的重费米子材料,最近报道了具有两个超导相的相图。在这种材料中,每个晶胞的两个不等价的Ce位点通过反转对称性相关,引入了对应于额外内部自由度的子晶格结构。在这里,我们提出了一个分类的可能的超导状态CeRh $_2$作为$_2$从两个Ce网站的角度来看。基于超导适合度分析和准经典Eilenberger方程,我们讨论了两个极限:Rashba自旋轨道耦合和层间跃迁主导的正常态。在这两个限制,我们能够找到两种情况下,产生的相图与实验定性一致:i)在磁场下的偶-奇跃迁的亚晶格内配对,和ii)在磁场下的奇-奇跃迁的亚晶格间配对。

英文摘要:

CeRh$_2$As$_2$, a non-symmorphic heavy fermion material, was recently reported to host a remarkable phase diagram with two superconducting phases. In this material, the two inequivalent Ce sites per unit cell, related by inversion symmetry, introduce a sublattice structure corresponding to an extra internal degree of freedom. Here we propose a classification of the possible superconducting states in CeRh$_2$As$_2$ from the two Ce-sites perspective. Based on the superconducting fitness analysis and the quasiclassical Eilenberger equations, we discuss two limits: Rashba spin-orbit coupling and inter-layer hopping dominated normal state. In both limits, we are able find two scenarios that generate phase diagrams in qualitative agreement with experiments: i) intra-sublattice pairing with an even-odd transition under magnetic field, and ii) inter-sublattice pairing with an odd-odd transition under magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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