Spin orbit magnetism and unconventional superconductivity
Abstract
We find an exotic spin excitation in a magnetically ordered system with spin orbit magnetism in two dimensions, where the order parameter has a net spin current and no net magnetization. Starting from a Fermi liquid theory, similar to that for a weak ferromagnet, we show that this excitation emerges from an exotic magnetic Fermi liquid state that is protected by a generalized Pomeranchuk condition. We derive the propagating mode using the Landau kinetic equation and find that the dispersion of the mode has a q behavior in leading order in two dimensions. We find an instability toward superconductivity induced by this exotic mode, and a further analysis based on the forward scattering sum rule strongly suggests that this superconductivity has p-wave pairing symmetry. We perform similar studies in the three-dimensional case, with a slightly different magnetic system, and find that the mode leads to a Lifshitz-like instability, most likely toward an inhomogeneous magnetic state in one of the phases.
- Publication:
-
Physical Review B
- Pub Date:
- March 2013
- DOI:
- 10.1103/PhysRevB.87.115134
- arXiv:
- arXiv:1211.1691
- Bibcode:
- 2013PhRvB..87k5134Z
- Keywords:
-
- 71.10.Ay;
- 71.70.Ej;
- 74.20.Rp;
- 75.50.-y;
- Fermi-liquid theory and other phenomenological models;
- Spin-orbit coupling Zeeman and Stark splitting Jahn-Teller effect;
- Pairing symmetries;
- Studies of specific magnetic materials;
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Superconductivity
- E-Print:
- 5 pages, 3 figures