Electrical conductance of a 2D packing of metallic beads under thermal perturbation - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Article Dans Une Revue EPL - Europhysics Letters Année : 2000

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

Résumé

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 distributions of the waiting time ∆t between two peaks is found to be a power-law ∆t −(1+αt) inside bursts. The exponent αt 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 αt = 1 − ζ, where ζ is the roughness exponent of the surface of the beads
Fichier principal
Vignette du fichier
0003510v1.pdf (417.96 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

cea-01373882 , version 1 (29-09-2016)

Identifiants

Citer

Daniel Bonamy, Louis Laurent, Philippe Claudin, Jean-Philippe Bouchaud, François Daviaud. Electrical conductance of a 2D packing of metallic beads under thermal perturbation. EPL - Europhysics Letters, 2000, 51, pp.614-620. ⟨10.1209/epl/i2000-00382-3⟩. ⟨cea-01373882⟩
64 Consultations
94 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More