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We use time- and angle-resolved photoemission to measure quasiparticlerelaxation dynamics across a laser-induced superconducting phase transition inBi2Sr2CaCu2O8+delta. Whereas low-fluence measurements reveal picoseconddynamics, sharp femtosecond dynamics emerge at higher fluence. Analyses of dataas a function of energy, momentum, and doping indicate that the closure of thenear-nodal gap and disruption of macroscopic coherence are primary mechanismsdriving this onset. The results demonstrate the important influence oftransient electronic structure on relaxation dynamics, which is relevant fordeveloping an understanding of nonequilibrium phase transitions.

Influence of Optically Quenched Superconductivity on Quasiparticle Relaxation Rates in Bi2Sr2CaCu2O8+delta