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A link between structural ordering and slow dynamics has recently attractedmuch attention from the context of the origin of glassy slow dynamics.Candidates for such structural order are icosahedral, exotic amorphous, andcrystal-like. Each type of order is linked to a different scenario of glasstransition. Here we experimentally access local structural order inpolydisperse hard spheres by particle-level confocal microscopy. We identifythe key structures as icosahedral and FCC-like order, both statisticallyassociated with slow particles. However, when approaching the glass transition,the icosahedral order does not grow in size whereas crystal-like order grows.It is the latter that governs the dynamics and is linked to dynamicheterogeneity. This questions the direct role of the local icosahedral orderingin glassy slow dynamics and suggests that the growing lengthscale of structuralorder is essential for the slowing down of dynamics and the nonlocalcooperativity in particle motion.

Roles of icosahedral and crystal-like order in hard spheres glass transition