Waterlike thermodynamic anomalies in a repulsive-step potential system

Details Waterlike thermodynamic anomalies in a repulsive-step potential system Waterlike thermodynamic anomalies in a repulsive-step potential system

2008-12-29

arxiv.org/abs/0812.4922v1

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 5 figures

Scientific paper

We report a computer-simulation study of the equilibrium phase diagram of a three-dimensional system of particles with a repulsive step potential. The phase diagram is obtained using free-energy calculations. At low temperatures, we observe a number of distinct crystal phases. We show that at certain values of the potential parameters the system exhibits the water-like thermodynamic anomalies: density anomaly and diffusion anomaly. The anomalies disappear with increasing the repulsive step width: their locations move to the region inside the crystalline phase.

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