Liquid State Anomalies for the Stell-Hemmer Core-Softened Potential

Details Liquid State Anomalies for the Stell-Hemmer Core-Softened Potential Liquid State Anomalies for the Stell-Hemmer Core-Softened Potential

1998-06-06

arxiv.org/abs/cond-mat/9806091v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages in one gzipped ps file including 11 figures; One RevTex and 11 gzipped eps figures

Scientific paper

We study the Stell-Hemmer potential using both analytic (exact $1d$ and approximate $2d$) solutions and numerical $2d$ simulations. We observe in the liquid phase an anomalous decrease in specific volume and isothermal compressibility upon heating, and an anomalous increase in the diffusion coefficient with pressure. We relate the anomalies to the existence of two different local structures in the liquid phase. Our results are consistent with the possibility of a low temperature/high pressure liquid-liquid phase transition.

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