Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-09-12
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, pdf-ReVTeX, presented at The European Conference Physics of Magnetism 2011, June 27 - July 1, 2011, Poznan
Scientific paper
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).
Kapcia Konrad
Murawski Szymon
Pawłowski Grzegorz
Robaszkiewicz Stanisław
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