Abstract
Using femtosecond pump-probe measurements, we present transient optical reflectivity measurements of metallic, superconducting and spin-glass ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$ cuprates. The rise time is temperature-independent and resolution-limited $(<50\phantom{\rule{0.3em}{0ex}}\mathrm{fs})$ for metallic sample, and is much faster than spin-glass samples $(\ensuremath{\sim}200\phantom{\rule{0.3em}{0ex}}\mathrm{fs})$ at all temperatures. A divergence in the electron-lattice relaxation $({\ensuremath{\tau}}_{\mathrm{R}})$ time with temperature is observed for the metallic samples, but not for spin-glass samples.
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