Using numerical diagonalization of a 4x4 cluster, we calculate on-site s, extended s and d pairing correlation functions (PCF) in an effective generalized Hubbard model for the cuprates, with nearest-neighbor correlated hopping and next nearest-neighbor hopping t'. The vertex contributions (VC) to the PCF are significantly enhanced, relative to the t-t'-U model. The behavior of the PCF and their VC, and signatures of anomalous flux quantization, indicate superconductivity in the d-wave channel for moderate doping and in the s-wave channel for high doping and small U.
@article{arxiv.cond-mat/9910012,
title = {Pairing Correlations in a Generalized Hubbard Model for the Cuprates},
author = {L. Arrachea and A. Aligia},
journal= {arXiv preprint arXiv:cond-mat/9910012},
year = {2009}
}