Local Melting and Drag for a Particle Driven Through a Colloidal Crystal

Details Local Melting and Drag for a Particle Driven Through a Colloidal Crystal Local Melting and Drag for a Particle Driven Through a Colloidal Crystal

2003-10-02

arxiv.org/abs/cond-mat/0310052v1

Phys. Rev. Lett. 92, 108301 (2004)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 postscript figures

Scientific paper

10.1103/PhysRevLett.92.108301

We numerically investigate a colloidal particle driven through a colloidal crystal as a function of temperature. When the charge of the driven particle is larger or comparable to that of the colloids comprising the crystal, a local melting can occur, characterized by defect generation in the lattice surrounding the driven particle. The generation of the defects is accompanied by an increase in the drag force on the driven particle, as well as large noise fluctuations. We discuss the similarities of these results to the peak effect phenomena observed for vortices in superconductors.

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