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The first jamming crossover: geometric and mechanical features.

Massimo Pica Ciamarra¹, Peter Sollich

¹CNR-SPIN, Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126, Napoli, Italy. massimo.picaciamarra@spin.cnr.it

The Journal of Chemical Physics

|April 6, 2013

Summary

This summary is machine-generated.

The jamming transition in disordered systems shows density anomalies linked to structural changes. These jamming crossovers reveal force network rearrangements, system softening, and altered normal mode properties.

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Area of Science:

Physics
Statistical Mechanics
Soft Matter

Background:

The jamming transition describes athermal systems with repulsive potentials.
Jamming crossovers occur at higher densities as particles contact subsequent shells.
Finite temperature leads to density anomalies like diffusivity and negative thermal expansion.

Purpose of the Study:

To elucidate structural changes at jamming crossovers.
To investigate mechanical property evolution with volume fraction.
To link density anomalies to structural rearrangements.

Main Methods:

Investigating structural evolution from jamming transition to beyond the first crossover.
Analyzing mechanical properties as a function of volume fraction.
Examining force network rearrangements and normal mode properties.

Main Results:

The first jamming crossover occurs at a defined volume fraction.
This crossover induces force network rearrangement and system softening.
Qualitative changes are observed in normal mode density of states and vector properties.

Conclusions:

Jamming crossovers are associated with significant structural rearrangements.
These structural changes explain observed dynamic and thermodynamic density anomalies.
Understanding these crossovers provides insight into the behavior of disordered systems.