Monte Carlo study of theXYvector Blume-Emery-Griffiths model forHe3He4mixtures in three dimensions

Autor:	S. J. Mitchell, David P. Landau, J. A. Plascak, R. T. S. Freire
Rok vydání:	2005
Předmět:	Hybrid Monte Carlo Physics Phase transition Condensed matter physics Tricritical point Quantum Monte Carlo Phase (matter) Dynamic Monte Carlo method Statistical physics Monte Carlo molecular modeling Phase diagram
Zdroj:	Physical Review E. 72
ISSN:	1550-2376 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:	https://explore.openaire.eu/search/publication?articleId=doi_________::0d16a98aa2f9f302e25c0ef54b7551cd https://doi.org/10.1103/physreve.72.056117 Zobrazit plný text záznamu