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Revista mexicana de física
versão impressa ISSN 0035-001X
Rev. mex. fis. vol.59 no.2 México Mar./Abr. 2013
Investigación
Critical and compensation temperatures for the mixed spin-3/2 and spin-5/2 Ising model
N. De La Espriella Velez*, C. Ortega Lopez*, F. Torres Hoyos**
*Grupo Avanzado de Materiales y Sistemas Complejos - GAMASCO, Departamento de Física, Universidad de Córdoba, Montería, Colombia. e-mail: ndelae52@gmail.com.
**Departamento de Física, Universidad de Córdoba, Montería, Colombia.
Recibido el 24 de agosto de 2012.
Aceptado el 5 de noviembre de 2012.
Abstract
We have studied the critical and compensation temperatures of a ferrimagnetic Ising system with mixed spins SiA= ±3/2, ±1/2 and σjB = ±5/2, ±3/2, ±1/2, by using Monte Carlo simulations. The spins are alternated on a square lattice, such that nearest neighbor interactions occur between different spins (SiA ↔ σjB) and next nearest neighbors interactions between spins of the same type (SiA ↔ SiA). We investigate the effects of crystal field D and the J2 ferromagnetic coupling of spins SiA on the critical and compensation temperatures of the system, calculating the phase diagrams at finite temperature at the (D/|J1| ,kBT/|J1|) and (J2/|J1|,kBT/|J1|) planes. When the Hamiltonian includes antiferromagnetic couplings between spins SiA and σjB, ferromagnetic between spins SiA and the term of single ion anisotropy D, the system presents compensation temperatures in a certain range of parameters, which depend on the intensity of the ferromagnetic interaction of spins SiA.
Keywords: Ising system; Monte Carlo; critical temperatures; compensation temperatures; crystal field.
PACS: 68.65.Cd; 77.84.Bw; 71.15.Mb; 71.15.Ap
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