Coexistent spin-triplet superconducting and ferromagnetic phases induced by the Hund's rule coupling and electronic correlations II: Effect of applied magnetic field
arXiv:1902.08444 · doi:10.1103/PhysRevB.99.205106
Abstract
Recently proposed local-correlation-driven pairing mechanism, describing ferromagnetic phases (FM1 and FM2) coexisting with spin-triplet superconductivity (SC) within a single orbitally degenerate Anderson lattice model, is extended to the situation with applied Zeeman field. The model provides and rationalizes in a semiquantitative manner the principal features of the phase diagram observed for in the field absence [cf. Phys. Rev. B , 224519 (2018)]. As spin-dependent effects play a crucial role for both the ferromagnetic and SC states, the role of the Zeeman field is to single out different stable spin-triplet SC phases. This analysis should thus be helpful in testing the proposed real-space pairing mechanism, which may be regarded as complementary to spin-fluctuation theory suitable for . Specifically, we demonstrate that the presence of the two distinct phases, FM1 and FM2, and associated field-driven metamagnetic transition between them, induce respective metasuperconducting phase transformation. At the end, we discuss briefly how the spin fluctuations might be incorporated as a next step into the considered here renormalized quasiparticle picture.
References in corpus (6)
- Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
- Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
- Ferromagnetism in UGe2 : A microscopic model
- Evidence for ferromagnetic spin-pairing superconductivity in UGe: A Ge-NQR study under pressure
- Properties of an almost localized Fermi liquid in applied magnetic field revisited: Statistically consistent Gutzwiller approach
- Enhancement of superconductivity by pressure-induced critical ferromagnetic fluctuations in UCoGe