Molecular dynamics computer simulations are used to investigate thedynamicsof a binary mixture of charged (Yukawa) particles with a size-ratio of 1:5. Wefind that the system undergoes a phase transition where the large particlescrystallize while the small particles remain in a fluid-like (delocalized)phase. Upon decreasing temperature below the transition, the small particlesbecome increasingly localized on intermediate time scales. This is reflected inthe incoherent intermediate scattering functions by the appearance of a plateauwith a growing height. At long times, the small particles show a diffusivehopping motion. We find that these transport properties are related tostructural correlations and the single-particle potential energy distributionof the small particles.
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