Superconducting Symmetries of Sr₂RuO₄ from First-Principles Electronic Structure

"Superconducting Symmetries of Sr₂RuO₄ from First-Principles Electronic Structure", O. Gingras, R. Nourafkan, A.-M. S. Tremblay, and M. Côté, Phys. Rev. Lett., 123, 217005 (2019)

Sr₂RuO₄
Although correlated electronic-structure calculations explain very well the normal state of Sr₂RuO₄, its superconducting symmetry is still unknown. Here we construct the spin and charge fluctuation pairing interactions based on its correlated normal state. Correlations significantly reduce ferromagnetic in favor of antiferromagnetic fluctuations and increase interorbital pairing. From the normal-state Eliashberg equations, we find spin-singlet d-wave pairing close to magnetic instabilities. Away from these instabilities, where charge fluctuations increase, we find two time-reversal symmetry-breaking spin triplets: an odd-frequency s wave, and a doubly degenerate interorbital pairing between d_xy and (d_yz,d_xz).

Ce contenu a été mis à jour le 2020-03-27 à 8 h 04 min.