Competition between d-wave superconductivity and magnetism in uniaxially strained Sr2RuO4
arxiv(2023)
摘要
The pairing symmetry of Sr_2RuO_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_2RuO_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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