The pairing symmetry in one-band Hubbard model having off-site Coulomb repulsion on top of on-site repulsion as model for γ band of Sr 2RuO4 was discussed. It is observed that singlet pairing dominates over triplet for one-band Hubbard model for the γ band. The dynamic cluster approximations (DCA) and quantum Monte Carlo (QMC) method are also employed to investigate superconductivity in extended Hubbard Hamiltonian which models γ band in ruthenate. The Hubbard model is mapped to a self-consistently embedded cluster of Anderson impurities such that DCA incorporates nonlocal spatial fluctuations.
ASJC Scopus subject areas
- Physics and Astronomy(all)