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Revista mexicana de física
Print version ISSN 0035-001X
Abstract
DE LA ESPRIELLA VELEZ, N.; MADERA YANCEZ, J. and PAEZ MESA, M. S.. Monte Carlo studies of critical phenomena in mixed spin-3/2 and spin-5/2 Ising model on square lattice. Rev. mex. fis. [online]. 2014, vol.60, n.6, pp.419-424. ISSN 0035-001X.
We used a Monte Carlo simulation to analize the magnetic behavior of Ising model of mixed spins SiA= ±3/2, ±1/2 and σjB = ±5/2, ±3/2, ±1/2, on a square lattice. Were studied the possible critical phenomena that may emerge in the region around the multiphase point (D/|J1|= -3, J2/|J1| = 1) and the dependence of the phase diagrams with the intensities of the anisotropy field of single ion (D/|J1|) and the ferromagnetic coupling of exchange spin SiA (J2/|J1|). The system displays first order phase transitions in a certain range of the parameters of the Hamiltonian, which depend on D/|J1| and |J2\|J1|. In the plane (D/|J1|,kBT/|J1|), the decrease of |D/|J1||, implies that the critical temperature, Tc, increases and the first order transition temperature, Tt, decreases. In the plane (J2/|J1|, kB T/|J1|), Tc increases with the increasing of J2/|J1|, while that Tt decreases.
Keywords : Ising system; single-ion anisotropy; Monte Carlo simulation; critical temperatures; first-order transitions.