MAGNETIC PHASE DIAGRAMS OF THE GENERALIZED SPIN-ONE-HALF FALICOV–KIMBALL MODEL
A combination of small-cluster exact-diagonalization calculations and a well-controlled approximative method is used to examine the ground-state phase diagrams of the spin-one-half Falicov–Kimball model extended by the spin-dependent on-site interaction (J) between localized spins and itinerant (d) electrons, as well as by external magnetic field (h). Both the magnetic ordering and metamagnetic transitions are analyzed as functions of h and the number of itinerant electrons (Nd) at selected J. Various magnetic superstructures including axial and diagonal spin stripes are observed for non-zero values of J and h. Moreover, it is shown that increasing h strongly stabilizes the fully and partially polarized states, while the non-polarized state is reduced.