Fragile to strong crossover in a model glass-former

Glass-forming liquids are broadly classified fragile and strong glass-forming liquids, which show non-Arrhenius and Arrhenius temperature dependence of dynamics, respectively, as the glass transition temperature is approached. In liquids like water or silica, a fragile to strong crossover is observed at lower temperatures. Though, most metallic glass-formers show fragile behaviour for a wide range of temperatures, it has recently been found that even metallic glass-forming liquids show a fragile to strong crossover in dynamics when really low temperatures are accessed.  In our work, we have computationally studied the Kob-Andersen model for a wide range of temperatures and have accessed really low temperatures below the mode coupling temperature(T_MCT). We find signatures of a possible fragile to strong dynamical crossover below T_MCT consistent with the previous findings in different metallic glass formers. We investigate aspects of dynamical heterogeneity and thermodynamics accompanying this crossover.