Inhomogeneous time-reversal symmetry breaking in Sr2RuO4

Willa, Roland; Hecker, Matthias; Fernandes, Rafael M.; Schmalian, Jörg

doi:10.1103/physrevb.104.024511

Title: Inhomogeneous time-reversal symmetry breaking in Sr₂RuO₄

Journal Article · 26 July 2021 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.104.024511 · OSTI ID:1852204

^[1];

^[2]; Fernandes, Rafael M. ^[3]; Schmalian, Jörg ^[2]

Karlsruhe Inst. of Technology (KIT) (Germany); OSTI
Karlsruhe Inst. of Technology (KIT) (Germany)
Univ. of Minnesota, Minneapolis, MN (United States)

We show that the observed time-reversal symmetry breaking (TRSB) of the superconducting state in Sr₂RuO₄ can be understood as originating from inhomogeneous strain fields near edge dislocations of the crystal. Specifically, we argue that, without strain inhomogeneities, Sr₂RuO₄ is a single-component, time-reversal symmetric superconductor, likely with d_x²-y² symmetry. However, due to the strong strain inhomogeneities generated by dislocations, a slowly decaying subleading pairing state contributes to the condensate in significant portions of the sample. As it phase winds around the dislocation, time-reversal symmetry is locally broken. Global phase locking and TRSB occur at a sharp Ising transition that is not accompanied by a change of the single-particle gap and yields a very small heat capacity anomaly. Our model thus explains the puzzling absence of a measurable heat capacity anomaly at the TRSB transition in strained samples and the dilute nature of the time-reversal symmetry broken state probed by muon spin rotation experiments. We propose that plastic deformations of the material may be used to manipulate the onset of broken time-reversal symmetry.

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Research Organization:: Univ. of Minnesota, Minneapolis, MN (United States)

Sponsoring Organization:: German Research Foundation (DFG); USDOE Office of Science (SC)

Grant/Contract Number:: SC0016371

OSTI ID:: 1852204

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Inhomogeneous time-reversal symmetry breaking in Sr2RuO4

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Title: Inhomogeneous time-reversal symmetry breaking in Sr₂RuO₄