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TT: Fachverband Tiefe Temperaturen

TT 37: Ruthenates

TT 37.6: Vortrag

Mittwoch, 29. März 2023, 16:15–16:30, HSZ 201

Effect of strain and momentum dependent spin-orbit coupling on the superconducting phase of Sr₂RuO₄ — •Jonas Hauck^1,2, Sophie Beck¹, Dante Kennes^2,3, Antoine Georges^1,4,5,6, and Olivier Gingras¹ — ¹Center for Computational Quantum Physics, Flatiron Institute, NY 10010, USA — ²Institut für Theorie der Statistischen Physik, RWTH Aachen, 52056 Aachen, Germany and JARA - Fundamentals of Future Information Technology — ³Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, 22761 Hamburg, Germany — ⁴Collège de France, 75005 Paris, France — ⁵CPHT, CNRS, École Polytechnique, Institut Polytechnique de Paris, 91128 Palaiseau, France — ⁶DQMP, Université de Genève, CH-1211 Genève, Switzerland

The nature of Sr₂RuO₄’s superconducting order parameter is a long-standing puzzle. First proposed to be a triplet superconductor, the current preferred picture is that of a degenerate singlet order parameter. The main driving force behind this development is the unification of experimental measurements and theoretical predictions. In this talk, we will employ a functional renormalization group approach to first-principles derived tight binding models to study the behavior of the leading order parameter under strain. Additionally, we examine the influence of momentum dependent spin-orbit coupling. Our results suggest the possible pairing candidates should be restricted to combinations of a d-wave pseudospin singlet with another order parameter whose critical temperature is not influenced by strain.