Superconducting state of Sr2RuO4 in the presence of longer-range Coulomb interactions
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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 chargefluctuations 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', d(xy), and helical (p) solutions, while both the g- and d(x2-y2)-wave channels remain noncompetitive. This suggests nodal time-reversal symmetry broken s'+ id(xy) 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'+ id(xy) solution agrees with the bulk of available experimental data.
Original language | English |
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Article number | 064507 |
Journal | Physical Review B |
Volume | 104 |
Issue number | 6 |
Number of pages | 16 |
ISSN | 2469-9950 |
DOIs | |
Publication status | Published - 20 Aug 2021 |
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ID: 276905062