On superconducting pairing in the two-band Hubbard model

• DOI: 10.1007/bf01313978
• Publication Date: 2005-03-26T06:16:47Z
• Authors: S. V. Lovtsov; N. M. Plakida; V. Yu. Yushankhai
• Keywords: 0103 physical sciences; 01 natural sciences

A two-band Hubbard model for highly hybridized copper 3d(x2−y2) and oxygen 2p(x,y) electrons in CuO2 plane with strong Coulomb repulsion at copper sites is considered. A real-space pairing mechanism induced by antiferromagnetic interaction of Kondo type is treated. To avoid the Gutzwiller approximation the projection technique for two-time Green functions for Hubbard operators is employed. It is shown that due to rigorous restriction of no double occupancy at copper sites the exchange-mediatedp-d pairing with a site-independent gap function isabsent.