Monte Carlo simulations of the classical two-dimensional discrete frustrated $Ï^4$ model
arXiv:cond-mat/0212373 · doi:10.1140/epjb/e2003-00062-2
Abstract
The classical two-dimensional discrete frustrated $Ï^4$ model is studied by Monte Carlo simulations. The correlation function is obtained for two values of a parameter $d$ that determines the frustration in the model. The ground state is a ferro-phase for $d=-0.35$ and a commensurate phase with period N=6 for $d=-0.45$. Mean field predicts that at higher temperature the system enters a para-phase via an incommensurate state, in both cases. Monte Carlo data for $d=-0.45$ show two phase transitions with a floating-incommensurate phase between them. The phase transition at higher temperature is of the Kosterlitz-Thouless type. Analysis of the data for $d=-0.35$ shows only a single phase transition between the floating-fluid phase and the ferro-phase within the numerical error.
5 figures, submitted to the European Physical Journal B