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We report time-resolved measurements of the photoinduced change in reflectivity, ΔR, in the Bi₂Sr₂Ca_1-yDyyCu₂O_8+δ (BSCCO) system of cuprate superconductors as a function of hole concentration. We find that the kinetics of quasiparticle decay and the sign of ΔR both change abruptly where the superconducting transition temperature Tc is maximal. These coincident changes suggest that a sharp transition in quasiparticle dynamics takes place precisely at optimal doping in the BSCCO system.
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Gedik et al. (2005) studied this question.
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