Disordering Transitions and Peak Effect in Polydisperse Particle Systems
arXiv:0704.3622 · doi:10.1103/PhysRevE.77.041401
Abstract
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.
8 pages, 8 postscript figures. Version to appear in PRE
References in corpus (16)
- Liquid Crystal Phases of Quantum Hall Systems
- Metastability and Glassy Behavior of a Driven Flux-Line Lattice
- Vortex phase diagram in rotating two-component Bose-Einstein condensates
- Two-component Bose-Einstein Condensates with Large Number of Vortices
- Colloidal Dynamics on Disordered Substrates
- Partial Clustering in Binary Two-Dimensional Colloidal Suspensions
- STM Imaging of Flux Line Arrangements in the Peak Effect Regime
- Phase Behavior of Type-II Superconductors with Quenched Point Pinning Disorder: A Phenomenological Proposal
- Static and dynamic coupling transitions of vortex lattices in disordered anisotropic superconductors
- Experimental observation of structural crossover in binary mixtures of colloidal hard spheres
- Peak Effect in Superconductors: Melting of Larkin Domains
- Dispersity-Driven Melting Transition in Two Dimensional Solids
- Peak Effect versus Skating in High Temperature Nanofriction
- Critical depinning force and vortex lattice order in disordered superconductors
- Charged inclusion in nematic liquid crystals
- Stripes, Clusters, and Nonequilibrium Ordering for Bidisperse Colloids with Repulsive Interactions
Cited by in corpus (6)
- Statics and Dynamics of Skyrmions Interacting with Pinning: A Review
- Evolution of shear-induced melting in dusty plasma
- Irreversible flow of vortex matter: polycrystal and amorphous phases
- Disordering, Clustering, and Laning Transitions in Particle Systems with Dispersion in the Magnus Term
- Dynamically Induced Locking and Unlocking Transitions in Driven Layered Systems with Quenched Disorder
- The strengthening of reentrant pinning by collective interactions in the peak effect