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Revista mexicana de física

Print version ISSN 0035-001X


ESPRIELLA VELEZ, N. De La; ORTEGA LOPEZ, C.  and  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.

Keywords : Ising system; Monte Carlo; critical temperatures; compensation temperatures; crystal field.

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