The Effect of a Random Crystal-Field on the Mixed Ising Spins (1/2, 3/2)
L. Bahmad, M.R. Benayad, A. Benyoussef and A. El Kenz
Faculté des Sciences, Département de Physique, Laboratoire de Magnétisme et Physique, des Hautes Energies, B.P. 1014, Rabat, Morocco
Received: October 22, 2010; in final form: January 4, 2011
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We study the magnetic properties of a mixed Ising ferrimagnetic system, in which the two interacting sublattices have spins σ, (± 1/2) and spins S, (± 3/2, ± 1/2) in the presence of a random crystal field, with the mean field approach. The results obtained, using mean field approach and Monte Carlo simulation, show the appearance of a new ferrimagnetic phase, namely the partly ferrimagnetic phase (mσ = -1/2, mS = + 1). Consequently, three topologically different types of phase diagrams have been given by mean field approach. The effect of increasing the exchange interaction parameter J, at very low temperature is also investigated.
DOI: 10.12693/APhysPolA.119.740
PACS numbers: 05.50.+q, 75.10.Hk, 75.50.Gg