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Quantum materials are amenable to non-equilibrium manipulation with light,enabling modification and control of macroscopic properties. Light-basedaugmentation of superconductivity is particularly intriguing. Copper-oxidesuperconductors exhibit complex interplay between spin order, charge order andsuperconductivity, offering the prospect of enhanced coherence by altering thebalance between competing orders. We utilize terahertz time domain spectroscopyto monitor the c-axis Josephson Plasma Resonance (JPR) inLa$_{2-x}$Ba$_{x}$CuO$_{4}$ (x = 0.115) as a direct probe of superconductivitydynamics following excitation with near infrared pulses. Starting from thesuperconducting state, c-axis polarized excitation with a fluence of 100$\mu$J/cm2 results in an increase of the far-infrared spectral weight by morethan an order of magnitude as evidenced by a blueshift of the JPR, interpretedas resulting from non-thermal collapse of the charge order. The photo-inducedsignal persists well beyond our measurement window of 300 ps and exhibitssignatures of spatial inhomogeneity. The electrodynamic response of this newmetastable state is consistent with enhanced superconducting fluctuations. Ourresults reveal that La$_{2-x}$Ba$_{x}$CuO$_{4}$ is highly sensitive tonon-equilibrium excitation over a wide fluence range, providing an unambiguousexample of photo-induced modification of order-parameter competition.

Photo-enhanced metastable c-axis electrodynamics in stripe ordered cuprate La$_{1.885}$Ba$_{0.115}$CuO$_{4}$