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Using a combination of resistance fluctuation (noise) and dielectricspectroscopy we investigate the nature of relaxor-type electronicferroelectricity in the organic conductor $\kappa$-(BETS)$_2$Mn[N(CN)$_2$]$_3$,a system representative for a wider class of materials, where strongcorrelations of electrons on a lattice of dimerized molecules results in aninsulating ground state. The two complementary spectroscopies reveal a distinctlow-frequency dynamics. By dielectric spectroscopy we detect an intrinsicrelaxation that is typical for relaxor ferroelectrics below themetal-to-insulator transition at $T_{\rm{MI}}\sim 25\,$K. Resistance noisespectroscopy reveals fluctuating two-level processes above $T_{\rm MI}$ whichstrongly couple to the applied electric field, a signature of fluctuating polarnanoregions (PNR), i.e. clusters of quantum electric dipoles fluctuatingcollectively. The PNR preform above the metal insulator transition. Uponcooling through $T_{\rm MI}$, a drastic increase of the low-frequency$1/f$-type fluctuations and slowing down of the charge carrier dynamics isaccompanied by the onset of strong non-equilibrium dynamics indicating a glassytransition of interacting dipolar clusters, the scaling properties of which areconsistent with a droplet model. The freezing of nano-scale polar clusters andnon-equilibrium dynamics is suggested to be a common feature of organicrelaxor-type electronic ferroelectrics and needs to be considered intheoretical models describing these materials.

Slow and Non-Equilibrium Dynamics due to Electronic Ferroelectricity in a Strongly-Correlated Molecular Conductor