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The interplay between crystal nucleation and the structure of the metastablefluid has been a topic of significant debate over recent years. In particular,it has been suggested that even in simple model systems such as hard or chargedcolloids, crystal nucleation might be foreshadowed by significant fluctuationsin local structure around the location where the first nucleus arises. Weinvestigate this using computer simulations of spontaneous nucleation events inboth hard and charged colloidal particles. To detect local structuralvariations, we use both standard and unsupervised machine learning methodscapable of finding hidden structures in the metastable fluid phase. We tracknumerous nucleation events for the face-centered cubic and body-centered cubiccrystal on a local level, and demonstrate that all signs of crystallinityemerge simultaneously from the very start of the nucleation process. We thusconclude that there is no precursor for the nucleation of charged colloids.

In search of a precursor for crystal nucleation of hard and charged colloids