Perturbation theory analysis of the strain-dependent superconducting phase diagram for Sr₂RuO₄

2023/08/28 by J. J. Deisz, Deisz, John
Earth and Planetary Sciences · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Geological and Geophysical Studies #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)

paper · pdf · doi:10.48550/arxiv.2308.14892

openalex publication_date 2023/08/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Previously, it was shown that a superconducting state dominated by singlet d_x²-y² intra-band pairs emerges from the fluctuation exchange approximation (FLEX) applied to a realistic model for Sr₂RuO₄, a result that is increasingly in alignment with experimental data. Here we apply FLEX to model the strain-dependent phase diagram of Sr₂RuO₄ and show that we are able to reproduce its unusual features. This adds weight to the argument that a predominantly d_x²-y² singlet pairing state represents a reasonable starting point for describing the superconducting properties of Sr₂RuO₄.

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