Phase Diagram of Semi-Hard-Core Bosons on a Square Lattice

Phase diagrams of charged “semi-hard-core” bosons are studied in the mean field approximation. An increase parameter local correlations is shown to lead transformation phase diagram system from form characteristic “hard-core” limiting with a parabolic dependence critical temperature charge ordering on boson concentration. The evolution between these cases dependent ratio model parameters and accompanied by various effects, such as change transition type, appearance new order–order transition, points.