On the phase diagram of the zero-bandwidth extended Hubbard model with intersite magnetic interactions for strong on-site repulsion limit
| Autor: | Murawski, Szymon, Kapcia, Konrad, Pawłowski, Grzegorz, Robaszkiewicz, Stanisław |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Acta Physica Polonica A, Vol. 121 (2012), No. 5-6, 1035-1037 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.12693/APhysPolA.121.1035 |
| Popis: | 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). Comment: 4 pages, 4 figures, pdf-ReVTeX, presented at The European Conference Physics of Magnetism 2011, June 27 - July 1, 2011, Poznan, Poland |
| Databáze: | arXiv |
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