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  • Letter
  • Open Access

Effects of orbital selective dynamical correlation on the spin susceptibility and superconducting symmetries in Sr2RuO4

Chang-Youn Moon*

  • Advanced Instrumentation Institute, Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea

  • *cymoon@kriss.re.kr
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Phys. Rev. Research 5, L022058 – Published 21 June, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022058

Abstract

We investigate the connection between the local electron correlation and the momentum dependence of the spin susceptibility and the superconducting gap functions in Sr2RuO4 using density-functional theory combined with dynamical mean-field theory. Adopting a frequency-dependent two-particle vertex moves the zero-energy spin susceptibility peaks towards the Brillouin zone center, compared with the random-phase approximation, which basically retains the peak positions closer to the Brillouin zone boundary as determined by the Fermi-surface nesting. We find that the dxy orbital plays a central role here via its enhanced correlation strength. Solving the linearized Eliashberg equation from this spin susceptibility, the prime candidates for the superconducting gap are an s-wave and a nearly degenerate d-wave solutions, all in the spin singlet. Furthermore, another set of degenerate spin-singlet gap functions emerges, odd with respect to the k point as well as orbital exchanges. We show that the stability of these gap functions is strongly dependent on the peak position of the spin susceptibility in the Brillouin zone.

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Phys. Rev. Research 5, L022058– Published 21 June, 2023
  • Received 28 November 2022
  • Revised 3 May 2023
  • Accepted 9 May 2023
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