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We report the dynamics of the cuprate superconductorLa$_{2-x}$Sr$_{x}$CuO$_4$ ($x = 0.14$) after intense photoexcitation utilizingnear-infrared (800 nm) optical pump-terahertz probe spectroscopy. In thesuperconducting state at 5 K, we observed a redshift of the Josephson plasmaresonance that sustains for hundreds of picoseconds after the photoexcitation,indicating the destruction of the $c$-axis superconducting coherence. We showthat the metastable spectral features can be described by the photoinducedsurface heating of the sample. We also demonstrate that the conventionalanalysis used to extract the spectra of the photoexcited surface region cangive rise to artifacts in the nonequilibrium response.

Light-induced nonequilibrium response of the superconducting cuprate La$_{2-x}$Sr$_{x}$CuO$_4$