Superconducting pairing in Sr${}_2$RuO${}_4$ from weak to intermediate coupling

Abstract

The unconventional superconductivity in Sr${}_2$RuO${}_4$ continues to attract considerable interest. While many measurements can be interpreted on the basis of chiral $p$-wave pairing with intriguing topological character, a number of exceptions hinder an unambiguous verification of such pairing. The pairing mechanism also remains under debate. In this paper, with effects of the sizable spin-orbit coupling accounted for, we reexamine the superconducting instabilities in Sr${}_2$RuO${}_4$ through systematic microscopic analysis within random phase approximation. Our calculations show that the odd-parity $p$-wave pairing is favored in the regime of extremely weak interactions, but that highly anisotropic even-parity pairings become most leading over a broad range of stronger interactions. These results could shed light on the nature of the enigmatic superconductivity in Sr${}_2$RuO${}_4$.

arXiv comment5.5 pages + supplemental materials. Minor edits. Published version

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Cited by in corpus (29)

• A proposal for reconciling diverse experiments on the superconducting state in Sr2RuO4
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• Theory of Strain-Induced Magnetic Order and Splitting of $T_c$ and $T_{\mathrm{TRSB}}$ in Sr${}_2$RuO${}_4$
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• Spin-orbit coupling and spin-triplet pairing symmetry in $\mathrm{S}{\mathrm{r}}_2\mathrm{Ru}{\mathrm{O}}_4$
• Exotic Cooper pairing in multi-orbital models of Sr${}_2$RuO${}_4$
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• Inter-orbital singlet pairing in Sr${}_2$RuO${}_4$: a Hund's superconductor
• Superconductivity in Sr${}_2$RuO${}_4$ thin film under biaxial strain
• Hidden anomalous Hall effect in Sr${}_2$RuO${}_4$ with chiral superconductivity dominated by the Ru $d_{xy}$ orbital
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• Possibility of mixed helical p-wave pairings in Sr${}_2$RuO${}_4$
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• Fluctuation-driven superconductivity in Sr${}_2$RuO${}_4$ from weak repulsive interactions
• Inter-orbital p- and d-wave pairings between $d_{xz/yz}$ and $d_{xy}$ orbitals in Sr${}_2$RuO${}_4$
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