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arXiv 2201.08917cond-mat.supr-concond-mat.mtrl-scicond-mat.str-elquant-ph
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钌酸锶超导体的频率相关互赝自旋解

Frequency-dependent Inter-pseudospin Solutions to Superconducting Strontium Ruthenate

Olivier Gingras, Nikita Allaglo, Reza Nourafkan, Michel Côté, André-Marie S. Tremblay

摘要:

Sr $_2$ RuO $_4$的超导序参量的长期困惑需要理论研究,包括很少考虑的影响。在这里,我们包括自旋-轨道耦合效应的电子结构,然后解决线性化的Eliashberg方程的赝自旋的基础上,包括自旋和电荷的波动诱导频率依赖的超导序参量的可能性。我们发现自旋-轨道耦合在轨道、自旋和频率空间中混合了偶数和奇数贡献,并且主要的赝自旋间对称性B $_{1g}^+$和A $_{2g}^-$在松原频率中分别具有偶数和奇数的轨道内分量。这两者之间的偶然简并可以解决明显的实验矛盾。

英文摘要:

The lasting puzzle of the superconducting order parameter of Sr$_2$RuO$_4$ calls for theoretical studies that include seldom-considered effects. Here we include spin-orbit coupling effects on the electronic structure and then solve the linearized Eliashberg equation in a pseudospin basis, including the possibility that spin and charge fluctuations induce frequency-dependent superconducting order parameters. We find that spin-orbit coupling mixes even and odd contributions in orbital, spin and frequency spaces and that leading inter-pseudospin symmetries, B$_{1g}^+$ and A$_{2g}^-$, have intra-orbital components respectively even and odd in Matsubara frequency. An accidental degeneracy between these could resolve apparent experimental contradictions.

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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