The penetrable square-well model: extensive versus non-extensive phase

Details The penetrable square-well model: extensive versus non-extensive phase The penetrable square-well model: extensive versus non-extensive phase

2011-06-09

arxiv.org/abs/1106.1750v1

Mol. Phys. 109, 2723-2736 (2011)

Physics

Condensed Matter

Soft Condensed Matter

18 pages, to appear in Molecular Physics, special issue dedicated to Prof. Luciano Reatto

Scientific paper

10.1080/00268976.2011.597357

The phase diagram of the penetrable square-well fluid is investigated through Monte Carlo simulations of various nature. This model was proposed as the simplest possibility of combining bounded repulsions at short scale and short-range attractions. We prove that the model is thermodynamically stable for sufficiently low values of the penetrability parameter, and in this case the system behaves similarly to the square-well model. For larger penetration, there exists an intermediate region where the system is metastable, with well defined fluid-fluid and fluid-solid transitions, at finite size, but eventually becomes unstable in the thermodynamic limit. We characterize the unstable non-extensive phase appearing at high penetrability, where the system collapses into an isolated blob of a few clusters of many ovelapping particles each.

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