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Revista mexicana de física

versão impressa ISSN 0035-001X

Rev. mex. fis. vol.60 no.6 México Nov./Dez. 2014

 

Investigación

 

Monte Carlo studies of critical phenomena in mixed spin-3/2 and spin-5/2 Ising model on square lattice

 

N. De La Espriella Vélezª, J. Madera Yancezb and M. S. Páez Mesac

 

a Grupo Avanzado de Materiales y Sistemas Complejos - GAMASCO, Departamento de Física, Universidad de Córdoba, Montería, Colombia, e-mail: ndelae52@gmail.com

b Grupo Tesseo-Departamento de Ciencias Básicas, Universidad del Sinú-Elías Bechara Zainúm, Córdoba, Montería, Colombia.

c Departamento de Química, Universidad de Córdoba, Montería, Colombia.

 

Received 11 June 2014.
Accepted 19 September 2014.

 

Abstract

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.

 

PACS: 68.65.Cd; 77.84.Bw; 71.15.Mb; 71.15.Ap

 

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