Abstract
Melting properties of a two-dimensional system comprised of ∼1 μm diameter, monodispersed, polystyrene spheres are compared with those of a system containing a one-percent concentration of larger spheres which have a larger interparticle interaction. The spheres interact via a dipolar interaction which is controlled externally. The translational and bond-orientational correlation functions are examined as a function of the dipole strength. The monodispersed system exhibits two-stage melting. In the system with a one-percent concentration of larger spheres the correlation functions are characteristic of a hexatic phase at the largest interaction strengths. Dislocations are pinned to the larger particles
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