Murawski, SzymonKapcia, Konrad JerzyPawłowski, GrzegorzRobaszkiewicz, Stanisław2015-05-202015-05-202015-02Acta Physica Polonica A, Vol. 121, No. 2, 281-284 (2015)0587-4246http://hdl.handle.net/10593/13047This is an author-created, un-copyedited version of an article accepted for publication in Acta Physica Polonica A.In this work we focus on the study of phase separation in the zero-bandwidth extended Hubbard with nearest-neighbors intersite Ising-like magnetic interactions $J$ and on-site Coulomb interactions U. The system has been analyzed by means of Monte Carlo simulations (in the grand canonical ensemble) on two dimensional square lattice (with N=LxL=400 sites) and the results for U/(4J)=2 as a function of chemical potential and electron concentration have been obtained. Depending on the values of interaction parameters the system exhibits homogeneous (anti-)ferromagnetic (AF) or non-ordered (NO) phase as well as phase separation PS:AF/NO state. Transitions between homogeneous phases (i.e. AF-NO transitions) can be of first or second order and the tricritical point is also present on the phase diagrams. The electron compressibility $K$ is an indicator of the phase separation and that quantity is of particular interest of this paper.eninfo:eu-repo/semantics/openAccessextended Hubbard modelatomic limitmagnetismphase separationMonte Carlo simulationsArtykułhttps://doi.org/10.12693/APhysPolA.127.281