Charge-fluctuation mediated dxy pairing for high-Tc superconductivity

✍ Scribed by T. Tsuji; O. Narikiyo; K. Miyake

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 440 KB
• Volume: 226
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)90213-5

✦ Synopsis

The effective interaction for the spin-singlet Cooper pairs is calculated using the two-dimensional d-p model for high-To 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 (U~) between the nearest-neighbor p and d sites is the dominant parameter, the interaction for d~ 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 (Ud) is incompatible.