Kapcia, Konrad Jerzy2015-05-202015-05-202015-04Journal of Superconductivity and Novel Magnetism, Vol. 28, No. 4, 1289-1294 (2015)1557-1939http://hdl.handle.net/10593/13049This is an author-created, un-copyedited version of an article accepted for publication in Journal of Superconductivity and Novel Magnetism.We present the ground state results for lattice models of superconductor (SC) with extremely short coherence length, which also involve the interplay with charge (CO) and (anti-)ferromagnetic orderings. Our preliminary results at zero-temperature (derived by means of the variational approach which treats the on-site interaction term exactly and the intersite interactions within the mean-field approximation, exact in $d\rightarrow+\infty$), yields that the SC phase can coexist with the CO or magnetic (M) phases in states with electron phase separation (PS:SC/CO and PS:SC/M, respectively).eninfo:eu-repo/semantics/openAccessextended Hubbard modelatomic limitphase separationsuperconductivitymagnetismcharge-orderpair hoppingphase diagramsArtykułhttps://doi.org/10.1007/s10948-014-2906-4