Curie temperature and quantum phase transitions in the Hubbard model with binary alloy disorder

Details Curie temperature and quantum phase transitions in the Hubbard model with binary alloy disorder Curie temperature and quantum phase transitions in the Hubbard model with binary alloy disorder

2004-11-06

arxiv.org/abs/cond-mat/0411168v1

Eur. Phys. J. B 45, 449-454 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 6 figures

Scientific paper

10.1140/epjb/e2005-00216-2

Magnetic and electric properties of the Hubbard model with binary alloy disorder are studied within the dynamical mean--field theory. A paramagnet--ferromagnet phase transition and a Mott--Hubbard metal--insulator transition are observed upon varying the alloy concentration. A disorder induced enhancement of the Curie temperature is demonstrated and explained by the effects of band splitting and subband filling. Different quantum phase transitions driven by changes of the alloy concentration are identified.

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