Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2007-04-26
Phys. Rev. E 77, 041401 (2008)
Physics
Condensed Matter
Soft Condensed Matter
8 pages, 8 postscript figures. Version to appear in PRE
Scientific paper
10.1103/PhysRevE.77.041401
We show numerically that in a binary system of Yukawa particles, a dispersity driven disordering transition occurs. In the presence of quenched disorder this disordering transition coincides with a marked increase in the depinning threshold, known as a peak effect. We find that the addition of poorly pinned particles can increase the overall pinning in the sample by increasing the amount of topological disorder present. If the quenched disorder is strong enough to create a significant amount of topological disorder in the monodisperse system, addition of a poorly pinned species generates further disorder but does not produce a peak in the depinning force. Our results indicate that for binary mixtures, optimal pinning occurs for topological defect fraction densities of 0.2 to 0.25. For defect densities below this range, the system retains orientational order. We determine the effect of the pinning density, strength, and radius on the depinning peak and find that the peak effect is more pronounced in weakly pinning systems.
Olson Reichhardt C. J.
Reichhardt Charles
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