Efecto de los Campos Cristalinos en un Ferromagneto de Ising Mixto Bidimensional

through monte carlo simulations, the magnetic behavior of ising ferromagnetic system on a square lattice composed of two sublattices a and b, with spins sia = 3/2 y sjb = 5/2, and crystalline fields da and db , are studied. the exchange interaction j1 , between spins sia and sjb , is ferromagnetic. the diagram of ground states, with different points where three phases coexist was calculated. the effect of the fields on the magnetization of the sublattices, specific heat and critical temperature was analyzed. possible first-order phase transitions are found for da = db , da<0 and db<0. when any of the fields is zero and the other increases, the critical temperature increases to a threshold value. the effect of db>0 is more crucial in the order of the system, that the effect de da>0.