U-J Synergy Effect for the High Tc Superconductors

Details U-J Synergy Effect for the High Tc Superconductors U-J Synergy Effect for the High Tc Superconductors

2004-09-07

arxiv.org/abs/cond-mat/0409141v2

Physics

Condensed Matter

Superconductivity

Final version, to appear in PRB

Scientific paper

10.1103/PhysRevB.71.064519

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.

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