Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-07-07
Acta Physica Polonica A, Vol. 118 (2010), No. 2, 353-355
Physics
Condensed Matter
Strongly Correlated Electrons
3 pages, 3 figures, presented at the 14th National School of Superconductivity - Superconductivity and heterogeneous condensed
Scientific paper
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).
Kapcia Konrad
Kłobus Waldemar
Robaszkiewicz Stanisław
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