Please use this identifier to cite or link to this item: https://hdl.handle.net/10593/7696
Title: Magnetic orderings and phase separations in the zero-bandwidth limit of the extended Hubbard model with intersite magnetic interactions
Authors: Kłobus, Waldemar
Kapcia, Konrad
Robaszkiewicz, Stanisław
Keywords: magnetic 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, 353-355 (2010)
Abstract: A simple effective model for a description of magnetically ordered insulators is analysed. The tight binding Hamiltonian consists of the effective on-site interaction (U) and intersite magnetic exchange interactions (Jz, Jxy) between nearest-neighbours. The phase diagrams of this model have been determined within the variational approach, which treats the on-site interaction term exactly and the intersite interactions within the mean-field approximation. We show that, depending on the values of interaction parameters and the electron concentration, the system can exhibit not only homogeneous phases: (anti-)ferromagnetic (F) and nonordered (NO), but also phase separated states (PS: F-NO).
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/a118z2p31.pdf
URI: http://hdl.handle.net/10593/7696
ISSN: 0587-4246
Appears in Collections:Artykuły naukowe (WF)

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