Activated-like hopping transition in weakly vibrated granular media
Institut de Génie Atomique, Département de Physique, Ecole Polytechnique
Fédérale de Lausanne - CH-1015 Lausanne, Switzerland
Accepted: 26 March 2001
The slow dynamics of a weakly vibrated granular medium is investigated using a low-frequency forced torsion pendulum method. A loss factor peak is observed in the pendulum response (or the granular susceptibility) as a function of the vibration intensity or the forcing frequency. The position of the peak follows an Arrhenius-like behaviour and the data can be described as an activated hopping process. The peak can be seen as a vibration-induced glass-like transition between a low- jammed phase and the high- fluid-like phase.
PACS: 45.70.-n – Granular systems / 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 64.70.Pf – Glass transitions
© EDP Sciences, 2001