2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/22355The ground-state phase diagram of two-dimensional Falicov-Kimball model with nearest-neighbour and next-nearest-neighbour hoppings (characterized by t,t' constants, respectively) has been studied in perturbative regime, i.e. in the case when on-site Coulomb interaction constant U is much larger than t,t' ones. The fourth-order phase diagram exhibits a rich structure, more complicated than for the ordinary Falicov-Kimball model. Possible experimental implications of the presence of nnn term are shortly discussed.17 pages including 5 eps figures; prepared in revtex 4. Version 2: references updatedStrongly Correlated ElectronsStatistical Mechanicstext