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The microscopic dynamics and aging of a soft thermosensitive suspension wasinvestigated by looking at the thermal fluctuations of tracers in thesuspension. Below and above the glass transition, the dense microgel particlessuspension was found to develop an heterogeneous dynamics, featured by a nonGaussian Probability Distribution Function (PDF) of the probes' displacements,with an exponential tail. We show that non Gaussian shapes are a characteristicof the ensemble-averaged PDF, while local PDF remain Gaussian. This shows thatthe scenario behind the non Gaussian van Hove functions is a spatiallyheterogeneous dynamics, characterized by a spatial distribution of locallyhomogeneous dynamical environments through the sample, on the considered timescales. We characterize these statistical distributions of dynamicalenvironments, in the liquid, supercooled, and glass states, and show that itcan explain the observed exponential tail of the van Hove functions observed inthe concentrated states. The intensity of spatial heterogeneities was found toamplify with increasing volume fraction. In the aging regime, it tends toincrease as the glass gets more arrested.

Spatially heterogeneous dynamics in a thermosensitive soft suspension before and after the glass transition