Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-12-14
Soft Matter 6, 2970 (2010)
Physics
Condensed Matter
Statistical Mechanics
5 pages, 4 figures; Submitted to Soft Matter, special issue on Granular and Jammed Materials
Scientific paper
10.1039/b926412d
We use the hyper-netted chain approximation of liquid state theory to analyze the evolution with density of the pair correlation function in a model of soft spheres with harmonic repulsion. As observed in recent experiments on jammed soft particles, theory predicts an `anomalous' (nonmonotonic) evolution of the intensity of the first peak when density is increased at constant temperature. This structural anomaly is a direct consequence of particle softness, and can be explained from purely equilibrium considerations, emphasizing the generality of the phenomenon. This anomaly is also predicted to have a non-trivial, `${\cal S}$-shaped', evolution with temperature, as a result of a competition between three distinct effects, which we describe in detail. Computer simulations support our predictions.
Berthier Ludovic
Jacquin Hugo
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