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arXiv · 2307.10006

Competition between d-wave superconductivity and magnetism in uniaxially strained Sr2RuO4

Jonas B. Profe·Sophie Beck·Dante M. Kennes·Antoine Georges·Olivier Gingras
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Abstract

The pairing symmetry of Sr$_2$RuO$_4$ is a long-standing fundamental question in the physics of superconducting materials with strong electronic correlations. We use the functional renormalization group to investigate the behavior of superconductivity under uniaxial strain in a two-dimensional realistic model of Sr$_2$RuO$_4$ obtained with density functional theory and incorporating the effect of spin-orbit coupling. We find a dominant $d_{x^2-y^2}$ superconductor mostly hosted by the $d_{xy}$-orbital, with no other closely competing superconducting state. Within this framework we reproduce the experimentally observed enhancement of the critical temperature under strain and propose a simple mechanism driven by the density of states to explain our findings. We also investigate the competition between superconductivity and spin-density wave ordering as a function of interaction strength. By comparing theory and experiment, we discuss constraints on a possible degenerate partner of the $d_{x^2-y^2}$ superconducting state.

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Jonas B. Profe, Sophie Beck, Dante M. Kennes, Antoine Georges, Olivier Gingras. 2023-07-19. Competition between d-wave superconductivity and magnetism in uniaxially strained Sr2RuO4. https://doi.org/10.1038/s41535-024-00661-3

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