Magnetic properties of the three-band Hubbard model
Abstract
We present magnetic properties of the three-band Hubbard model in the para- and antiferromagnetic phase on a hypercubic lattice calculated with the Dynamical Mean-Field Theory (DMFT). To allow for solutions with broken spin-symmetry we extended the approach to lattices with AB-like structure. Above a critical sublattice magnetization m_d=0.5 one can observe rich structures in the spectral-functions similar to the t-J model which can be related to the well known bound states for one hole in the Neel-background. In addition to the one-particle properties we discuss the static spin-susceptiblity in the paramagnetic state at the points q=0 and q=(pi,pi,pi,...) for different dopings delta. The delta-T-phase-diagram exhibits an enhanced stability of the antiferromagnetic state for electron-doped systems in comparison to hole-doped. This asymmetry in the phase diagram is in qualitative agreement with experiments for high-T_c materials.
Keywords
Cite
@article{arxiv.cond-mat/9805314,
title = {Magnetic properties of the three-band Hubbard model},
author = {Th. Maier and M. B. Zoelfl and Th. Pruschke and J. Keller},
journal= {arXiv preprint arXiv:cond-mat/9805314},
year = {2009}
}
Comments
revised version, to be published