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We perform time resolved photoelectron spectroscopy measurements of optimallydoped $\tn{Bi}_2\tn{Sr}_2\tn{CaCu}_2\tn{O}_{8+\delta}$ (Bi-2212) and$\tn{Bi}_2\tn{Sr}_{2-x}\tn{La}_{x}\tn{Cu}\tn{O}_{6+\delta}$ (Bi-2201). Theelectrons dynamics show that inelastic scattering by nodal quasiparticlesdecreases when the temperature is lowered below the critical value of thesuperconducting phase transition. This drop of electronic dissipation isastonishingly robust and survives to photoexcitation densities much larger thanthe value sustained by long-range superconductivity. The unconventionalbehaviour of quasiparticle scattering is ascribed to superconductingcorrelations extending on a length scale comparable to the inelastic path. Ourmeasurements indicate that strongly driven superconductors enter in a regimewithout phase coherence but finite pairing amplitude. The latter vanishes nearto the critical temperature and has no evident link with the pseudogap observedby Angle Resolved Photoelectron Spectroscopy (ARPES).

Quasiparticles dynamics in high-temperature superconductors far from equilibrium: an indication of pairing amplitude without phase coherence