Correlated electrons in the presence of disorder

Details Correlated electrons in the presence of disorder Correlated electrons in the presence of disorder

2010-03-12

arxiv.org/abs/1003.2498v2

Eur. Phys. J. Special Topics 180, 135 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 7 figures, final version, typos corrected, references updated, submitted to Eur. Phys. J. for publication in the Spe

Scientific paper

Several new aspects of the subtle interplay between electronic correlations and disorder are reviewed. First, the dynamical mean-field theory (DMFT)together with the geometrically averaged ("typical") local density of states is employed to compute the ground state phase diagram of the Anderson-Hubbard model at half-filling. This non-perturbative approach is sensitive to Anderson localization on the one-particle level and hence can detect correlated metallic, Mott insulating and Anderson insulating phases and can also describe the competition between Anderson localization and antiferromagnetism. Second, we investigate the effect of binary alloy disorder on ferromagnetism in materials with $f$-electrons described by the periodic Anderson model. A drastic enhancement of the Curie temperature $T_c$ caused by an increase of the local $f$-moments in the presence of disordered conduction electrons is discovered and explained.

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