KINETICS OF THE SPIN-2 BLUME-CAPEL MODEL UNDER A TIME-DEPENDENT OSCILLATING EXTERNAL FIELD
Keskin M., Canko O., Ertas M.

Received: April 12, 2007

PACS: 05.50.+q, 05.70.Fh, 64.60.Ht, 75.10.Hk

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Within a mean-field approach and using the Glauber-type stochastic dynamics, we study the kinetics of the spin-2 Blume-Capel model in the presence of a time-varying (sinusoidal) magnetic field. We investigate the time dependence of the average order parameter and the behavior of the average order parameter in a period, which is also called the dynamic order parameter, as a function of the reduced temperature. The nature (continuous and discontinuous) of a transition is characterized by the dynamic order parameter. The dynamic phase transition points are obtained and the phase diagrams are presented in the reduced magnetic field amplitude and reduced temperature plane. The phase diagrams exhibit one dynamic tricritical point; besides a disordered and one ordered phases, there are three phase coexistence regions that are strongly dependent on the interaction parameter.