Liquid-State Anomalies and the Stell-Hemmer Core-Softened Potential
Liquid-State Anomalies and the Stell-Hemmer Core-Softened Potential
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 …