d-Wave Pairing State in Terms of the Zhang-Rice Singlets
arXiv:0704.3610 · doi:10.1088/1751-8113/40/34/002
Abstract
In cuprate superconductors doping is believed to create holes on the O-sites, which couple antiferromagnetically with holes on the Cu-sites to form the so-called Zhang-Rice singlets. Here we study a d-wave pairing state based on the Zhang-Rice singlet states. Upper and lower bounds of an off-diagonal long-range order parameter with d-wave symmetry for this state are estimated. We also introduce a concrete model with on-site Coulomb repulsion and kinds of antiferromagnetic interactions whose ground state is this d-wave pairing state.
19 pages, 3 figures;In Verson 2, section 'Summary and Remarks' has been added, typos have been corrected, and some minor changes have been made