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Issue 40, 2013
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High-order jamming crossovers and density anomalies

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We demonstrate that particles interacting via core-softened potentials exhibit a series of successive density anomalies upon isothermal compression, leading to oscillations in the diffusivity and thermal expansion coefficient, with the latter reaching negative values. These finite-temperature density anomalies are then shown to correspond to zero-temperature high-order jamming crossovers. These occur when particles are forced to come into contact with neighbours in successive coordination shells upon increasing the density. The crossovers induce anomalous behavior of the bulk modulus, which oscillates with density. We rationalize the dependence of these crossovers on the softness of the interaction potential, and relate the jamming crossovers and the anomalous diffusivity via the properties of the vibrational spectrum.

Graphical abstract: High-order jamming crossovers and density anomalies

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Article information

29 May 2013
05 Aug 2013
First published
13 Aug 2013

Soft Matter, 2013,9, 9557-9561
Article type

High-order jamming crossovers and density anomalies

M. P. Ciamarra and P. Sollich, Soft Matter, 2013, 9, 9557
DOI: 10.1039/C3SM51505B

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