title: Inverse melting in a two-dimensional off-lattice model.
abstract: We carry out computer simulations of a simple, two-dimensional off-lattice model that exhibits inverse melting. The monodisperse system comprises core-softened disks interacting through a repulsive square shoulder located inside an attractive square well. By systematically varying the potential parameters, we increase the pressure range over which the liquid freezes to a crystal upon isobaric heating. The effect is largely controlled by the extent of the shoulder. Despite occurring in two dimensions, the melting transition is first order and to a liquid, rather than to a hexatic or quasicrystal phase. We also provide comment on a commonly employed correlation function used to determine the degree of translational ordering in a system.
authors.affiliation: Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X7, Canada.
authors.forename: Ahmad M
authors.initials: AM
authors.lastname: Almudallal
authors.affiliation: Department of Physics, Yeshiva University, 500W 185th Street, New York, New York 10033, USA.
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Buldyrev
authors.affiliation: Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X7, Canada.
authors.forename: Ivan
authors.initials: I
authors.lastname: Saika-Voivod