The effective interaction for the spin-singlet Cooper pairs is calculated using the two-dimensional d-p model for high-Tc cuprates on the basis of a renormalized perturbation of the Fermi liquid: first forming the quasiparticles variationally by the Gutzwiller approximation, then treating the residual interactions among quasiparticles by the RPA. In the charge-fluctuation region, where the p hole is moderately doped and the repulsive interaction (Upd) between the nearest-neighbor p and d sites is the dominant parameter, the interaction for dxy pairs is attractive, while it is repulsive both for extended-s and dx2-y2 pairs. The on-site repulsive interaction for p electrons (Up) is compatible with this tendency, whereas the one for d electrons (Ũd) is incompatible.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering