Kinetic phase transition in the mixed-spin ising model
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| Format: | Artículo científico |
| Langue: | en |
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Sociedade Brasileira de Física
2004
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| _version_ | 1876460822145794048 |
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| author | W. Figueiredo |
| author_facet | W. Figueiredo |
| contents | Kinetic phase transition in the mixed-spin ising model W. Figueiredo M. Godoy Física, Astronomía y Matemáticas In this work we studied a ferromagnetic mixed-spin Ising model including a single ion crystal-field term. Themodel system consists of two interpenetrating sublattices with spins σ = 1/2 and S = 1. The spins σ = 1/2occupy the sites of one sublattice, their nearest-neighbours are spins S on the other sublattice, and vice versa.The system is in contact with a heat bath, the spins flipping according to the Metropolis transition rate and, atthe same time, subject to an external flow of energy, which is simulated by a two-spin flip process. The modelis studied via the dynamical pair approximation and through Monte Carlo simulations. We have determinedthe phase diagram of the model in the plane crystal-field D versus competition parameter p. The parameter paccounts for the competition between the one- and two-spin flip processes. In the pair approximation, the phasediagram, at high temperatures, present three phases separated by two transition lines: a continuous transitionline between the ferromagnetic and paramagnetic phases, and a first-order transition line between the paramagneticand antiferromagnetic phases. However, Monte Carlo simulations predict the same topology for the phasediagram as the pair approximation, but all the transition lines are continuous for any value of the temperature. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434217 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2A Vol.34 |
| format | Artículo científico |
| id | redalyc_46434217 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Kinetic phase transition in the mixed-spin ising model W. Figueiredo Física, Astronomía y Matemáticas Kinetic phase transition in the mixed-spin ising model W. Figueiredo M. Godoy Física, Astronomía y Matemáticas In this work we studied a ferromagnetic mixed-spin Ising model including a single ion crystal-field term. Themodel system consists of two interpenetrating sublattices with spins σ = 1/2 and S = 1. The spins σ = 1/2occupy the sites of one sublattice, their nearest-neighbours are spins S on the other sublattice, and vice versa.The system is in contact with a heat bath, the spins flipping according to the Metropolis transition rate and, atthe same time, subject to an external flow of energy, which is simulated by a two-spin flip process. The modelis studied via the dynamical pair approximation and through Monte Carlo simulations. We have determinedthe phase diagram of the model in the plane crystal-field D versus competition parameter p. The parameter paccounts for the competition between the one- and two-spin flip processes. In the pair approximation, the phasediagram, at high temperatures, present three phases separated by two transition lines: a continuous transitionline between the ferromagnetic and paramagnetic phases, and a first-order transition line between the paramagneticand antiferromagnetic phases. However, Monte Carlo simulations predict the same topology for the phasediagram as the pair approximation, but all the transition lines are continuous for any value of the temperature. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434217 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.2A Vol.34 |
| title | Kinetic phase transition in the mixed-spin ising model |
| topic | Física, Astronomía y Matemáticas |
| url | https://www.redalyc.org/articulo.oa?id=46434217 |