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Colloidal particles, which are ubiquitous, have become ideal testing groundsfor the structural glass transition (SGT) theories. In these systems glassybehavior is manifested as the density of the particles is increased. Thus, softcolloidal particles with varying degree of softness capture diverse glassforming properties, observed normally in molecular glasses. By performingBrownian dynamics simulations for a binary mixture of micron-sized chargedcolloidal suspensions, known to form Wigner glasses, we show that by tuning thesoftness of the potential, achievable by changing the monovalent saltconcentration, there is a continuous transition between fragile to strongbehavior. Remarkably, this is found in a system where the well characterizedpotential between the colloidal particles is isotropic. We also show that thepredictions of the random first order transition (RFOT) theory quantitativelydescribes the universal features such as the growing correlation length,$\xi\sim (\phi_K/\phi - 1)^{-\nu}$ with $\nu = 2/3$ where $\phi_K$, theanalogue of the Kauzmann temperature, depends on the salt concentration. Asanticipated by the RFOT predictions, we establish a causal relationship betweenthe growing correlation length and a steep increase in the relaxation time anddynamic heterogeneity. The broad range of fragility observed in Wigner glassesis used to draw analogies with molecular glasses. The large variations in thefragility is found only when the temperature dependence of the viscosity isexamined for a large class of diverse glass forming materials. In sharpcontrast, this is vividly illustrated in a single system that can beexperimentally probed. Our work also shows that the RFOT predictions areaccurate in describing the dynamics over the entire density range, regardlessof the fragility of the glasses, implying that the physics describing the SGTis universal.

Fragile-to-Strong Crossover, growing length scales, and dynamic heterogeneity in Wigner Glasses