Frequency-dependent Inter-pseudospin Solutions to Superconducting Strontium Ruthenate

• URL: http://arxiv.org/abs/2201.08917v2
• Date: Mon, 31 Jan 2022 23:14:49 GMT
• Title: Frequency-dependent Inter-pseudospin Solutions to Superconducting Strontium Ruthenate
• Authors: Olivier Gingras, Nikita Allaglo, Reza Nourafkan, Michel C\^ot\'e, Andr\'e-Marie S. Tremblay
• Abstract summary: We find that spin-orbit coupling mixes even and odd contributions in orbital, spin and frequency spaces. We find that leading inter-pseudospin symmetries, B$_1g+$ and A$_2g-$, have intra-orbital components respectively even and odd in Matsubara frequency.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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