| Issue |
Europhys. Lett.
Volume 51, Number 6, September II 2000
|
|
|---|---|---|
| Page(s) | 614 - 620 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i2000-00382-3 | |
| Published online | 01 September 2002 | |
Electrical conductance of a 2D packing of metallic beads under thermal perturbation
1
Service de Physique de l'Etat Condensé, CEA Saclay 91191 Gif-sur-Yvette
Cedex, France
2
Technion, Israel Institute of Technology, Physics Department - Haifa 32000,
Israel
Received:
4
April
2000
Accepted:
14
July
2000
Electrical conductivity measurements on a 2D packing of metallic beads have
been performed to study internal rearrangements in weakly perturbed
granular materials. Small thermal perturbations lead to large non-Gaussian
conductance fluctuations. These fluctuations are found to be intermittent in
time, with peaks gathered in bursts. The distribution of the waiting time
between two peaks is found to be a power law 
inside bursts. The exponent 
is independent of the bead network, the intensity of perturbation and
external stress. These bursts are interpreted as the signature of individual
bead creep rather than collective vault reorganisations. We propose a simple
model giving 
, where ζ is
the roughness exponent of the surface of the beads.
PACS: 45.70.-n – Granular systems / 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 46.55.+d – Tribology and mechanical contacts
© EDP Sciences, 2000
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