Electrical conductance of a 2D packing of metallic beads under thermal perturbation

Details Electrical conductance of a 2D packing of metallic beads under thermal perturbation Electrical conductance of a 2D packing of metallic beads under thermal perturbation

2000-03-31

arxiv.org/abs/cond-mat/0003510v1

Physics

Condensed Matter

Statistical Mechanics

7 pages, 6 figures

Scientific paper

10.1209/epl/i2000-00382-3

Electrical conductivity measurements on a 2D packing of metallic beads have been performed to study internal rearrangements in weakly pertubed granular materials. Small thermal perturbations lead to large non gaussian conductance fluctuations. These fluctuations are found to be intermittent and gathered in bursts. The distributions of the waiting time between to peaks is found to be a power law inside bursts. The exponent is independent of the bead network, the intensity of the perturbation and external stress. these bursts are interpreted as the signature of individual bead creep rather than collective vaults reorganisations. We propose a simple model linking the exponent of the waiting time distribution to the roughness exponent of the surface of the beads.

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