Density anomalies and high-order jamming crossovers

TL;DR

This paper investigates the relationship between density anomalies and high-order jamming crossovers in particle assemblies, revealing how these crossovers influence system responses and plastic instabilities during compression.

Contribution

It demonstrates the correlation between jamming crossovers and increased non-affine responses, clarifying the evolution of jammed systems through successive plastic instabilities.

Findings

Jamming crossovers are linked to density anomalies like increased diffusivity.

Non-affine response of systems increases at jamming crossovers.

Jammed systems undergo successive Eshlby-like plastic instabilities during compression.

Abstract

Jamming crossovers occur at zero temperature in assemblies of particles interacting via finite range repulsive potentials, when on increasing the density particles make contacts with those of subsequent coordination shells. Density anomalies, including an increased diffusivity upon isothermal compression and a negative thermal expansion coefficient, are the finite temperature signatures of the jamming crossovers. In this manuscript we show that the jamming crossovers are correlated to an increase of the non affine response of the system to density changes, and clarify that jammed systems evolve upon compression through subsequent Eshlby-like plastic instabilities.