A novel approach to electronic correlations and magnetism of crystals based on realistic electronic structure calculations is reviewed. In its simplest form it is a combination of the ``local density approximation'' (LDA) and the dynamical mean field theory (DMFT) approaches. Using numerically exact QMC solution to the effective DMFT multi-orbital quantum-impurity problem, a successful description of electronic structure and finite temperature magnetism of transition metals has been achieved. We discuss a simplified perturbation LDA+DMFT scheme which combines the T-matrix and fluctuation-exchange approximation (TM-FLEX). We end with a discussion of cluster generalization of the non-local DMFT scheme and its applications to the magnetism and superconductivity of high-Tc superconductors.
@article{arxiv.cond-mat/0211076,
title = {Spectral density functional approach to electronic correlations and magnetism in crystals},
author = {A. I. Lichtenstein and M. I. Katsnelson and G. Kotliar},
journal= {arXiv preprint arXiv:cond-mat/0211076},
year = {2007}
}
Comments
37 pages, to be published in: "Electron Correlations and Materials Properties 2" ed. by A. Gonis (Kluwer, NY)