1 research outputs found
Spectral Density Functional Approach to Electronic Correlations and Magnetism in Crystals
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.Comment: 37 pages, to be published in: "Electron Correlations and Materials
Properties 2" ed. by A. Gonis (Kluwer, NY