title: Polymorphism in simple liquids: a Gibbs ensemble Monte Carlo study.
abstract: We perform Gibbs ensemble Monte Carlo (GEMC) simulations of a one-component system of hard spheres with a repulsive shoulder and an attractive well. We show the existence of two distinct liquid-gas and liquid-liquid phase equilibria. The GEMC estimate of the critical parameters, as following from an interpolation of the binodal points, is only slightly influenced by finite size effects. The liquid-gas critical temperature and pressure are lower than those of the liquid-liquid phase separation. A discussion of our findings in comparison with those of previous numerical studies is also presented.
authors.affiliation: Istituto Nazionale per la Fisica della Maleria (INFM) and Dipartimento di Fisica, Università di Messina, Contrada Papardo, CP 50, 98166 Messina, Italy.
authors.forename: Benedetto
authors.initials: B
authors.lastname: Pellicane
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Pellicane
authors.forename: Gianpietro
authors.initials: G
authors.lastname: Malescio