SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 39: Phase Transformations: Simulation and Machine Learning

MM 39.2: Vortrag

Donnerstag, 30. März 2023, 12:00–12:15, SCH A 215

Measurement and simulation of cooling times in pump-probe experiments of phase transitions with latent heat — •Daniel Kazenwadel, Noel Neathery, and Peter Baum — Universität Konstanz, Konstanz, Germany

Ultrafast pump-probe experiments are often limited by the need to wait for a sample's back reaction to take place between adjacent laser pulses. Here we investigate by experiments and simulations how the sample geometry influences the cooling rate of VO2, a strongly correlated phase-transition material with substantial latent heat. We measure back reaction times of milliseconds, microseconds and nanoseconds in free-standing thin-films, coated substrates and bulk crystals, respectively. A simple latent heat model reproduces the behavior of all geometries and can therefore be used to predict the speed of the back reaction in other phase-change materials as well.