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

2021/01/18 by Astrid T. Rømer, P. J. Hirschfeld, Brian M. Andersen
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics #Physics of Superconductivity and Magnetism #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.104.064507

published as Phys. Rev. B 104, 064507 (2021) · 4 pages, 2 figures + supplementary material

arxiv created 2021/01/18 · openalex created_date 2021/02/01 · openalex publication_date 2021/08/20 · arxiv updated 2021/08/25 · openalex updated_date 2026/08/05

Abstract

The material Sr₂RuO₄ is notorious for the difficulty in reconciling all experimental characterizations of its superconducting order parameter. In this theoretical study, the authors explore what superconducting order parameters are most favorable from the perspective of spin-fluctuation mediated pairing, taking into account the multiorbital nature of the system and its sizable spin-orbit coupling. They find that longer-range Coulomb interactions induce a near-degeneracy between nodal s-wave and d_x\phantom\rule00exy superconductivity, suggesting a ground-state condensate with time-reversal symmetry breaking of the form s+i\phantom\rule00exd_x\phantom\rule00exy.

Citations

• Anisotropy of the Incommensurate Fluctuations inSr2RuO4: A Study with Polarized Neutrons
• Gap Structure of the Spin-Triplet SuperconductorSr2RuO4Determined from the Field-Orientation Dependence of the Specific Heat
• Phenomenological theory of unconventional superconductivity
• Superconductivity inSr2RuO4mediated by Coulomb scattering
• Group-theoretical classification of superconducting states of strontium ruthenate
• Degeneracy between even- and odd-parity superconductivity in the quasi-1D Hubbard model and implications for Sr2RuO4