Reentrant melting of the exp-6 fluid: the role of the repulsion softness

Details Reentrant melting of the exp-6 fluid: the role of the repulsion softness Reentrant melting of the exp-6 fluid: the role of the repulsion softness

2009-07-06

arxiv.org/abs/0907.0957v1

Phys. Chem. Liq. 48 (2010) 477

Physics

Condensed Matter

Soft Condensed Matter

11 pages, 7 figures, in press on Physics and Chemistry of Liquids

Scientific paper

10.1080/00319100903131542

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.

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