Correlated Ostwald ripening in two dimensions

We report results from an experimental study of coarsening in thin layers of succinonitrile in the presence of impurities. We quench the latter from the liquid phase to different temperatures within the liquid-solid coexistence region thus controling the solid area fraction . As is increased from 0.13 to 0.40, liquidlike order develops among the coarsening crystals due to diffusional interactions. The latter give rise to local correlations between the size and rate of growth of crystals within a neighborhood of size (). We study these and compare our findings with recent theoretical models of coarsening.