title: Bicritical universality of the anisotropic Heisenberg model in a crystal field.
abstract: The bicritical properties of the three-dimensional classical anisotropic Heisenberg model in a crystal field are investigated through extensive Monte Carlo simulations on a simple cubic lattice, using Metropolis and Wolff algorithms. Field-mixing and multidimensional histogram techniques were employed in order to compute the probability distribution function of the extensive conjugate variables of interest and, using finite-size scaling analysis, the first-order transition line of the model was precisely located. The fourth-order cumulant of the order parameter was then calculated along this line and the bicritical point located with good precision from the cumulant crossings. The bicritical properties of this point were further investigated through the measurement of the universal probability distribution function of the order parameter. The results lead us to conclude that the studied bicritical point belongs in fact to the three-dimensional Heisenberg universality class.
authors: Universidade Federal de São João del Rei, Campus Dom Bosco, Praça Dom Helvécio, 74-Fábricas 36301-160, São João del Rei, MG-Brazil.
authors: R T S
authors: RT
authors: Freire
authors: Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, C.P. 702, 30123-970, Belo Horizonte, MG-Brazil.|Universidade Federal da Paraíba, Centro de Ciências Exatas e da Natureza-Campus I, Departamento de Física-CCEN Cidade Universitária 58051-970, João Pessoa, PB-Brazil.|Center for Simulational Physics, University of Georgia, Athens, Georgia 30602, USA.
authors: J A
authors: JA
authors: Plascak