| Autor: |
R T S, Freire, S J, Mitchell, J A, Plascak, D P, Landau |
| Rok vydání: |
2005 |
| Zdroj: |
Physical review. E, Statistical, nonlinear, and soft matter physics. 72(5 Pt 2) |
| ISSN: |
1539-3755 |
| Popis: |
A version of the Vector Blume-Emery-Griffiths model with three-dimensional spins was studied on a simple cubic lattice by Monte Carlo simulations. We obtained the phase diagram, which reproduces, for a range of the parameters of the model, the topology of the one observed for bulk mixtures of 3He--4He. The phase diagram displays a superfluid, 4He-rich phase which undergoes a phase transition to a normal phase. This transition is first or second order, depending on the region of the phase diagram examined. One of the main features of this diagram is the existence of a tricritical point, which, for some values of the parameters of the model, decomposes into a critical endpoint and a double critical endpoint. These points were located with reasonable precision. This study provides the basis for the subsequent study of dynamic properties of 3He--4He mixtures. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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