d-wave superconductivity in a generalized Hubbard model
Superconductivity
2009-10-31 v1
Abstract
We consider an extended Hubbard model with nearest-neighbor correlated hopping and next nearest-neighbor hopping t' obtained as an effective model for cuprate superconductors. Using a generalized Hartree-Fock BCS approximation, we find that for high enough t' and doping, antiferromagnetism is destroyed and the system exhibits d-wave superconductivity. Near optimal doping we consider the effect of antiferromagnetic spin fluctuations on the normal self-energy using a phenomenological susceptibility. The resulting superconducting critical temperature as a function of doping is in good agreement with experiment.
Cite
@article{arxiv.cond-mat/9809187,
title = {d-wave superconductivity in a generalized Hubbard model},
author = {Liliana Arrachea and A. A. Aligia},
journal= {arXiv preprint arXiv:cond-mat/9809187},
year = {2009}
}
Comments
7 pages, including 2 figures