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Transition metal oxides possess complex free energy surfaces with competingdegrees of freedom. Photoexcitation allows shaping of such rich energylandscapes. In epitaxially strained $\mathrm{La_{0.67}Ca_{0.33}MnO_3}$, opticalexcitation with a sub-100 fs pulse above $2\ \mathrm{mJ/cm^2}$ leads to apersistent metallic phase below 100 K. Using single-shot optical and terahertzspectroscopy, we show that this phase transition is a multi-step process. Weconclude that the phase transition is driven by partial charge order melting,followed by growth of the persistent metallic phase on longer timescales. Atime-dependent Ginzburg-Landau model can describe the fast dynamics of thereflectivity, followed by longer timescale in-growth of the metallic phase.

Dynamics of a Persistent Insulator-to-Metal Transition in Strained Manganite Films