Please use this identifier to cite or link to this item: https://hdl.handle.net/10593/7700
Title: On the phase diagram of the zero-bandwidth extended Hubbard model with intersite magnetic interactions for strong on-site repulsion limit
Authors: Murawski, Szymon
Kapcia, Konrad
Pawłowski, Grzegorz
Robaszkiewicz, Stanisław
Keywords: magnetic orderings
phase separations
extended Hubbard model
atomic limit
Monte Carlo simulations
Issue Date: Jun-2012
Publisher: Polish Academy of Sciences, Institute of Physics, al. Lotników 32-46, Pl-02-668 Warsaw, Poland
Citation: Acta Physica Polonica A, Vol. 121, No. 5-6, 1035-1037 (2012)
Abstract: In this report we have analyzed a simple effective model for a description of magnetically ordered insulators. The Hamiltonian considered consists of the effective on-site interaction (U) and the intersite Ising-like magnetic exchange interaction (J) between nearest neighbors. For the first time the phase diagrams of this model have been determined within Monte Carlo simulation on 2D-square lattice. They have been compared with results obtained within variational approach, which treats the on-site term exactly and the intersite interactions within mean-field approximation. We show within both approaches 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).
Sponsorship: National Science Center (NCN) as a research project in years 2011-2013, under grant No. DEC-2011/01/N/ST3/00413; European Commission and Ministry of Science and Higher Education (Poland) - partial financial support from European Social Fund – Operational Programme "Human Capital" – POKL.04.01.01-00-133/09-00 – "Proinnowacyjne kształcenie, kompetentna kadra, absolwenci przyszłości".
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/121/a121z5p13.pdf
URI: http://przyrbwn.icm.edu.pl/APP/PDF/121/a121z5p13.pdf
http://hdl.handle.net/10593/7700
ISSN: 0587-4246
Appears in Collections:Artykuły naukowe (WF)

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