Clustering transitions in vibro-fluidized magnetized granular materials

Details Clustering transitions in vibro-fluidized magnetized granular materials Clustering transitions in vibro-fluidized magnetized granular materials

2002-03-23

arxiv.org/abs/cond-mat/0203488v2

Phys. Rev. E 67, 021302 (2003)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevE.67.021302

We study the effects of long range interactions on the phases observed in cohesive granular materials. At high vibration amplitudes, a gas of magnetized particles is observed with velocity distributions similar to non-magnetized particles. Below a transition temperature compact clusters are observed to form and coexist with single particles. The cluster growth rate is consistent with a classical nucleation process. However, the temperature of the particles in the clusters is significantly lower than the surrounding gas, indicating a breakdown of equipartition. If the system is quenched to low temperatures, a meta-stable network of connected chains self-assemble due to the anisotropic nature of magnetic interactions between particles.

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