Superconducting state of Sr2RuO4 in the presence of longer-range Coulomb interactions

Rømer, Astrid T.; Hirschfeld, Peter J.; Andersen, Brian M.

doi:10.1103/physrevb.104.064507

Title: Superconducting state of Sr 2 RuO 4 in the presence of longer-range Coulomb interactions

Journal Article · 19 August 2021 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.104.064507 · OSTI ID:1992514

^[1];

^[2]; Andersen, Brian M. ^[3]

Univ. of Copenhagen (Denmark); U. Florida
Univ. of Florida, Gainesville, FL (United States)
Univ. of Copenhagen (Denmark)

The symmetry of the superconducting condensate in Sr₂RuO₄ remains controversial after recent experiments overturned the dominant chiral p-wave paradigm.We perform a theoretical study of pairing by spin- and chargefluctuations in Sr₂RuO₄, including the effects of spin-orbit coupling, and both local and longer-range Coulomb repulsion. The latter has important consequences for Sr₂RuO₄ due to the near-degeneracy of symmetry-distinct pairing states in this material. Here we find leading nodal s', d_xy, and helical (p) solutions, while both the g- and d_x²–y²-wave channels remain noncompetitive. This suggests nodal time-reversal symmetry broken s' + id_xy or s' + ip phases, promoted by longer-range Coulomb repulsion, as the most favorable candidates for Sr₂RuO₄. We analyze the properties of these states and show that the s' + id_xy solution agrees with the bulk of available experimental data.

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Research Organization:: Univ. of Florida, Gainesville, FL (United States); University of Florida, Gainesville, FL (United States)

Sponsoring Organization:: Independent Research Fund Denmark; USDOE

Grant/Contract Number:: FG02-05ER46236

OSTI ID:: 1992514

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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