Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session M29: Strongly Correlated Systems, Including Quantum Fluids and Solids IX
8:00 AM–11:00 AM,
Wednesday, March 8, 2023
Room: Room 221
Sponsoring
Unit:
DCMP
Chair: Wonhee Ko, University of Tennessee, Knoxville
Abstract: M29.00013 : Effects of dynamic local correlation on the spin susceptibility and superconducting symmetries in Sr2RuO4
10:24 AM–10:36 AM
Presenter:
Chang-Youn Moon
(Korea Research Inst of Standards and Sci)
Author:
Chang-Youn Moon
(Korea Research Inst of Standards and Sci)
Here we demonstrate how the dynamic local correlations shape the susceptibility in the k-space and the pairing symmetry within the framework of density-functional theory combined with dynamical mean-field theory (DFT+DMFT). We find that using frequency-dependent two-particle vertex moves the zero energy spin susceptibility peaks towards the Gamma point, compared with random-phase approximation which basically retains the peak positions closer to the Brillouin zone boundary as determined by the Fermi-surface nesting. dxy orbital plays a central role here via its enhanced correlation strength. When linearized-Eliashberg equation is constructed from the susceptibility and solved, the prime candidate of the superconducting gap symmetry is a nodal s-wave, as well as a nearly degenerate d-wave solution, all in spin singlet. Furthermore, another set of degenerate spin singlet gap functions emerges, odd with respect to both k-point and orbital exchanges. We discuss the compatibility of these gap functions with experimental observations.
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