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arXiv · 1710.00010

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

Li-Da Zhang·Wen Huang·Fan Yang·Hong Yao
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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$_4$.

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Li-Da Zhang, Wen Huang, Fan Yang, Hong Yao. 2018-03-03. Superconducting pairing in Sr$_2$RuO$_4$ from weak to intermediate coupling. https://doi.org/10.1103/physrevb.97.060510

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