Some properties of two dimensional extended repulsive Hubbard model with intersite magnetic interactions - a Monte Carlo study

dc.contributor.authorMurawski, Szymon
dc.contributor.authorKapcia, Konrad Jerzy
dc.contributor.authorPawłowski, Grzegorz
dc.contributor.authorRobaszkiewicz, Stanisław
dc.date.accessioned2014-10-28T08:21:18Z
dc.date.available2014-10-28T08:21:18Z
dc.date.issued2014-10
dc.descriptionThis 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://dx.doi.org/10.12693/APhysPolA.126.A-110pl_PL
dc.description.abstractIn this paper the two dimensional extended Hubbard model with intersite magnetic Ising-like interaction in the atomic limit is analyzed by means of the classical Monte Carlo method in the grand canonical ensemble. Such an effective simple model could describe behavior of insulating (anti)ferromagnets. In the model considered the Coulomb interaction (U) is on-site and the magnetic interactions in z-direction (J>0, antiferromagnetic) are restricted to nearest-neighbors. Simulations of the model have been performed on a square lattice consisting of N=LxL=400 sites (L=20) in order to obtain the full phase diagram for U/(4J)=1. Results obtained for on-site repulsion (U>0) show that, apart from homogeneous non-ordered (NO) and ordered magnetic (antiferromagnetic, AF) phases, there is also a region of phase separation (PS: AF/NO) occurrence. We present a phase diagram as well as some thermodynamic properties of the model for the case of U/(4J)=1 (and arbitrary chemical potential and arbitrary electron concentration). The AF-NO transition can be second-order as well as first-order and the tricritical point occurs on the diagram.pl_PL
dc.description.sponsorshipNational Science Center (NCN) as a research project in years 2011-2013, under grant No. DEC-2011/01/N/ST3/00413; National Science Center (NCN) as a doctoral scholarship in years 2013-2014 No. DEC- 2013/08/T/ST3/00012; 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"; The Fundation of Adam Mickiewicz University in Poznańpl_PL
dc.identifier.citationActa Physica Polonica A, Vol. 126, No. 4-A, A-110--A-113 (2014)pl_PL
dc.identifier.doihttps://doi.org/10.12693/APhysPolA.126.A-110
dc.identifier.issn0587-4246
dc.identifier.urihttp://hdl.handle.net/10593/11980
dc.language.isoenpl_PL
dc.publisherPolish Academy of Sciences, Institute of Physics, al. Lotników 32-46, PL-02-668 Warsaw, Polandpl_PL
dc.subjectextended Hubbard modelpl_PL
dc.subjectatomic limitpl_PL
dc.subjectphase separationpl_PL
dc.subjectmagnetismpl_PL
dc.subjectphase diagramspl_PL
dc.subjectmean-fieldpl_PL
dc.subjectMonte Carlo simulationspl_PL
dc.titleSome properties of two dimensional extended repulsive Hubbard model with intersite magnetic interactions - a Monte Carlo studypl_PL
dc.typeArtykułpl_PL

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