U-J Synergy Effect for the High Tc Superconductors
Superconductivity
2009-11-10 v2 Strongly Correlated Electrons
Abstract
Using renormalization group and exact diagonalization of small clusters we investigate the ground state phase diagram of a two-dimensional extended Hubbard model with nearest-neighbor exchange interaction J, in addition to the local Coulomb repulsion U. The main instabilities are antiferromagnetism close to half-filling and d-wave superconductivity in the doped system. Our results suggest that the combined action of J and U interactions provide a remarkably efficient mechanism to enhance both d-wave superconducting and antiferromagnetic correlations.
Keywords
Cite
@article{arxiv.cond-mat/0409141,
title = {U-J Synergy Effect for the High Tc Superconductors},
author = {Liliana Arrachea and Drazen Zanchi},
journal= {arXiv preprint arXiv:cond-mat/0409141},
year = {2009}
}
Comments
Final version, to appear in PRB