Kinetics of a mixed spin-1/2 and spin-3/2 Ising ferrimagnetic model
| Autor: | Deviren, B., Keskin, M., Canko, O. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | J. Magn. Magn. Mater., 321 (2009) 458. |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.jmmm.2008.10.006 |
| Popis: | We present a study, within a mean-field approach, of the kinetics of a mixed ferrimagnetic model on a square lattice in which two interpenetrating square sublattices have spins that can take two values, $\sigma=\pm1/2$, alternated with spins that can take the four values, $S=\pm3/2, \pm1/2$. We use the Glauber-type stochastic dynamics to describe the time evolution of the system with a crystal-field interaction in the presence of a time-dependent oscillating external magnetic field. The nature (continuous and discontinuous) of transition is characterized by studying the thermal behaviors of average order parameters in a period. The dynamic phase transition points are obtained and the phase diagrams are presented in the reduced magnetic field amplitude $(h)$ and reduced temperature $(T)$ plane, and in the reduced temperature and interaction parameter planes, namely in the $(h, T)$ and $(d, T)$ planes, $d$ is the reduced crystal-field interaction. The phase diagrams always exhibit a tricritical point in $(h, T)$ plane, but do not exhibit in the $(d, T)$ plane for low values of $h$. The dynamic multicritical point or dynamic critical end point exist in the $(d, T)$ plane for low values of $h$. Moreover, phase diagrams contain paramagnetic $(p)$, ferromagnetic $(f)$, ferrimagnetic $(i)$ phases, two coexistence or mixed phase regions, $(f+p)$ and $(i+p)$, that strongly depend on interaction parameters. Comment: 13 pages, 6 figures, submitted to Journal of Magnetism and Magnetic Materials |
| Databáze: | arXiv |
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