Phase diagrams of the kinetic metamagnetic spin-3/2 Blume-Capel model in an oscillating external field

摘要

Dynamic phase diagrams are calculated, within a mean-field approach, for the kinetic metamagnetic spin-3/2 Blume-Capel model in the presence of a time-dependent oscillating external magnetic field using Glauber-type stochastic dynamics and six fundamental types of phase diagrams are found in the reduced temperature (T) and magnetic-field amplitude parameter (h) plane. The phase diagrams exhibit one, two or three dynamic tricritical points, and besides the paramagnetic (P), the antiferromagnetic-3/2 (AF3/2), the antiferromagnetic-1/2 (AF1/2) phases, three coexistence phase regions, namely AF3/2 + P, AF1/2 + P, AF3/2 + AF1/2, exist depending upon the interaction parameters. The dynamic phase boundaries between the P and AF3/2 phases are always second-order lines, but between the P and AF1/2 phases are second- or/and first-order lines. All other dynamic phase boundaries among the disordered, ordered phases and coexistence phase regions are first-order lines. We have investigated the influence of the crystal field interaction (D) and we obtain five different phase diagram topologies in (d, T) plane, d = D / We have also studied the influence of the frequency on the phase boundaries as well as the dynamic tricritical point and found that the topologies of the phase diagrams slightly change.