Density anomaly in a competing interactions lattice gas model
Statistical Mechanics
2016-08-31 v1
Abstract
We study a very simple model of a short-range attraction and an outer shell repulsion as a test system for demixing phase transition and density anomaly. The phase-diagram is obtained by applying mean field analysis and Monte Carlo simulations to a two dimensional lattice gas with nearest-neighbors attraction and next-nearest-neighbors repulsion (the outer shell). Two liquid phases and density anomaly are found. The coexistence line between these two liquid phases meets a critical line between the fluid and the low density liquid at a tricritical point. The line of maximum density emerges in the vicinity of the tricritical point, close to the demixing transition.
Cite
@article{arxiv.cond-mat/0409138,
title = {Density anomaly in a competing interactions lattice gas model},
author = {Alan B. de Oliveira and Marcia C. Barbosa},
journal= {arXiv preprint arXiv:cond-mat/0409138},
year = {2016}
}