Phys. Rev. B 68, 195112 (2003) [6 pages]Finite-temperature properties of the generalized Falicov-Kimball modelReceived 4 July 2003; published 18 November 2003 The thermodynamic properties of the extended Falicov-Kimball model (FKM) for spinless fermions are studied as a function of temperature, doping, and interlevel spacing on the two-dimensional lattice. Thermodynamic quantities are calculated using the finite-temperature Lanczos method with additional phase averaging for a system of 4×4 sites. Changes of the thermodynamic properties are studied as the system evolves from its symmetric limit represented by the original Hubbard model to the other limiting case, which corresponds to the original FKM for spinless fermions. Our results indicate that valence transition exists in the extended Falicov-Kimball model. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.195112
DOI:
10.1103/PhysRevB.68.195112
PACS:
71.27.+a, 71.10.Fd
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