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We present the first systematic observation of scaling of thermal hysteresiswith the temperature scanning rate around an abrupt thermodynamic transition incorrelated electron systems. We show that the depth of supercooling andsuperheating in vanadium sesquioxide (V2O3) shifts with the temperature quenchrates. The dynamic scaling exponent is close to the mean field prediction of2/3. These observations, combined with the purely dissipative continuousordering seen in "quench-and-hold" experiments, indicate departures fromclassical nucleation theory toward a barrier-free phase ordering associatedwith critical dynamics. Observation of critical-like features and scaling in athermally induced abrupt phase transition suggests that the presence of aspinodal-like instability is not just an artifact of the mean field theoriesbut can also exist in the transformation kinetics of real systems, survivingfluctuations.

Kinetic Spinodal Instabilities in the Mott Transition in V2O3: Evidence from Hysteresis Scaling and Dissipative Phase Ordering