Reentrant melting of the exp-6 fluid: the role of the repulsion softness
arXiv:0907.0957 · doi:10.1080/00319100903131542
Abstract
We investigate the phase behaviour of a system of particles interacting through the exp-6 pair potential, a model interaction that is appropriate to describe effective interatomic forces under high compression. The soft-repulsive component of the potential is being varied so as to study the effect on reentrant melting and density anomaly. Upon increasing the repulsion softness, we find that the anomalous melting features persist and occur at smaller pressures. Moreover, if we reduce the range of downward concavity in the potential by extending the hard core at the expenses of the soft-repulsive shoulder, the reentrant part of the melting line reduces in extent so as it does the region of density anomaly.
11 pages, 7 figures, in press on Physics and Chemistry of Liquids
References in corpus (11)
- A quantum fluid of metallic hydrogen suggested by first-principles calculations
- Phase diagram of the Gaussian-core model
- Structural Order for One-Scale and Two-Scale Potentials
- Quasi-binary amorphous phase in a 3D system of particles with repulsive-shoulder interactions
- Metastable liquid-liquid coexistence and density anomalies in a core-softened fluid
- Static and Dynamic Anomalies in a Repulsive Spherical Ramp Liquid: Theory and Simulation
- Re-entrant melting and freezing in a model system of charged colloids
- Evaluation of phenomenological one-phase criteria for the melting and freezing of softly repulsive particles
- The zero-temperature phase diagram of soft-repulsive particle fluids
- Interplay between structure and density anomaly for an isotropic core-softened ramp-like potential
- Anomalous melting behavior under extreme conditions: hard matter turning "soft"