Superconducting state of Sr2RuO4 in the presence of longer-range Coulomb interactions
Astrid T. Rømer, P. J. Hirschfeld, Brian M. Andersen
DOI 10.1103/PhysRevB.104.064507 · Physical Review B
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Abstract
The symmetry of the superconducting condensate in Sr2RuO4 remains controversial after recent experiments overturned the dominant chiral p-wave paradigm. We perform a theoretical study of pairing by spin- and charge-fluctuations in Sr2RuO4, including the effects of spin-orbit coupling, and both local and longer-range Coulomb repulsion. The latter has important consequences for Sr2RuO4 due to the near-degeneracy of symmetry-distinct pairing states in this material. We find leading nodal s′, dxy, and helical (p) solutions, while both the g- and dx2−y2-wave channels remain noncompetitive. This suggests nodal time-reversal symmetry broken s′+idxy or s′+ip phases, promoted by longer-range Coulomb repulsion, as the most favorable candidates for Sr2RuO4. We analyze the properties of these states and show that the s′+idxy solution agrees with the bulk of available experimental data.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | onset |
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