Phase diagram of a two-dimensional system with anomalous liquid properties

Abstract

Using Monte Carlo simulation techniques, we calculate the phase diagram for a square shoulder-square well potential in two dimensions that has been previously shown to exhibit liquid anomalies consistent with a metastable liquid-liquid critical point. We consider the liquid, gas and five crystal phases, and find that all the melting lines are first order, despite a small range of metastability. One melting line exhibits a temperature maximum, as well as a pressure maximum that implies inverse melting over a small range in pressure.

11 pages, 13 figures

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• Phase diagram and melting scenarios of two-dimensional Hertzian spheres
• Random pinning elucidates the nature of melting transition in two-dimensional core-softened potential system
• Waterlike anomalies in a 2D core-softened potential
• Phase diagram of the system with the repulsive shoulder potential in two dimensions: density functional approach
• Anomalous Melting Scenario of the Two-Dimensional Core-Softened System
• Inverse melting in a two-dimensional off-lattice model
• Solid-solid collapse transition in a two dimensional model molecular system
• Two-dimensional core-softened model with water like properties. Study by thermodynamic perturbation theory