Please use this identifier to cite or link to this item: https://hdl.handle.net/10593/7695
Title: Charge orderings and phase separations in the atomic limit of the extended Hubbard model with intersite density-density interactions
Authors: Kapcia, Konrad
Kłobus, Waldemar
Robaszkiewicz, Stanisław
Keywords: charge orderings
phase separations
extended Hubbard model
atomic limit
Issue Date: Aug-2010
Publisher: Polish Academy of Sciences, Institute of Physics, al. Lotników 32-46, Pl-02-668 Warsaw, Poland
Citation: Acta Physica Polonica A, Vol. 118, No. 2, 350-352 (2010)
Abstract: We have studied a simple effective model of charge ordered insulators. The tight binding Hamiltonian consists of the effective on-site interaction U and the intersite density-density interaction Wij (both: nearest-neighbor and next-nearest-neighbor). In the analysis of the phase diagrams and thermodynamic properties of this model we have adopted the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-field approximation. Our investigations of the general case (as a function of the electron concentration) have shown that the system exhibits various critical behaviors including among others bicritical, tricritical, critical-end and isolated critical points. In this report we concentrate on the metastable phases and transitions between them. One finds that the first- and second order transitions between metastable phases can exist in the system. These transitions occur in the neighborhood of first as well as second order transitions between stable phases. For the case of on-site attraction the regions of metastable homogeneous phases occurrence inside the ranges of phase separated states stability have been also determined.
Description: This is an author-created, un-copyedited version of an article accepted for publication in Acta Physica Polonica A. The Version of Record is available online at http://przyrbwn.icm.edu.pl/APP/PDF/118/a118z2p30.pdf
URI: http://hdl.handle.net/10593/7695
ISSN: 0587-4246
Appears in Collections:Artykuły naukowe (WF)

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