https://doi.org/10.1140/epjb/e2005-00216-2
Curie temperature in the Hubbard model with alloy disorder
1
Institute of Theoretical Physics,
Warsaw University, ul. Hoża 69, 00-681 Warszawa, Poland
2
FGAN - FKIE,
Neuenahrer Strasse 20, 53343 Wachtberg, Germany
Corresponding author: a byczuk@fuw.edu.pl
Received:
14
January
2005
Revised:
25
March
2005
Published online:
13
July
2005
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.
PACS: 71.10.-w – Theories and models of many-electron systems / 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
