Fluctuation-driven superconductivity in Sr2RuO4 from weak repulsive interactions
Abstract
We provide results for the leading superconducting instabilities for a model pertaining to Sr2RuO4 obtained within spin-fluctuation mediated superconductivity in the very weak-coupling limit. The theory incorporates spin-orbit coupling (SOC) effects both in the band structure and in the pairing kernel in the form of associated magnetic anisotropies. The leading superconducting phase is found to be dx2-y2 and a nodal s-wave state. However, the odd-parity helical solution can become leading either for small SOC and Hund’s coupling J in the weak U-limit, or in the opposite limit with large SOC and J at larger values of the Hubbard-U. The odd-parity chiral solution is never found to be leading. Finally we discuss the form of the resulting superconducting spectral gaps in the different explored parameter regimes.
- Publication:
-
Modern Physics Letters B
- Pub Date:
- July 2020
- DOI:
- 10.1142/S0217984920400527
- arXiv:
- arXiv:2001.11265
- Bibcode:
- 2020MPLB...3440052R
- Keywords:
-
- Fluctuation-driven superconductivity;
- Sr2RuO4;
- spin–orbit coupling;
- 74.20.-z;
- 74.25.Dw;
- 74.20.Rp;
- 74.20.Mn;
- Theories and models of superconducting state;
- Superconductivity phase diagrams;
- Pairing symmetries;
- Nonconventional mechanisms;
- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 5 figures