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Revista mexicana de física
versión impresa ISSN 0035-001X
Resumen
ESPRIELLA VELEZ, N. De La; ORTEGA LOPEZ, C. y TORRES HOYOS, F.. Critical and compensation temperatures for the mixed spin-3/2 and spin-5/2 Ising model. Rev. mex. fis. [online]. 2013, vol.59, n.2, pp.95-101. ISSN 0035-001X.
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.
Palabras llave : Ising system; Monte Carlo; critical temperatures; compensation temperatures; crystal field.