Abstract

DE LA ESPRIELLA, Nicolás A; CASIANO, Gladys R  and  ORTEGA, César. Crystal Field Effects in a Mixed Two Dimensional Ising Ferromagnet. Inf. tecnol. [online]. 2012, vol.23, n.5, pp.125-134. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642012000500013.

Through Monte Carlo simulations, the magnetic behavior of Ising ferromagnetic system on a square lattice composed of two sublattices A and B, with spins S_i^A = 3/2 y s_j^B = 5/2, and crystalline fields D_A and D_B , are studied. The exchange interaction J₁ , between spins S_i^A and s_j^B , 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 D_A = D_B , D_A<0 and D_B<0. When any of the fields is zero and the other increases, the critical temperature increases to a threshold value. The effect of D_B>0 is more crucial in the order of the system, that the effect de D_A>0.

Keywords : mixed Ising model; Monte Carlo; critical temperatures; crystal fields.

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