- Conference date: 6–17 October 2008
- Location: Salerno (Italy)
In this work an optical pump‐probe set‐up is used to study the photo‐induced non‐equilibrium dynamics of a superconducting underdoped Bi2212 single crystal in a strong excitation regime The use of a tunable repetition rate 120 fs pulsed laser source allows us to avoid significant average heating of the sample and to optimize the signal‐to‐noise ratio in the detection of the transient reflectivity variation. A discontinuity of the transient reflectivity is observed at high excitation intensities Numerical simulations of the heat diffusion problem indicate that, in this regime, the local temperature of the sample is lower than confirming the impulsive nature of this phenomenon. The quasi‐particles (QP) dynamics in the strongly perturbed superconducting state is analysed within the framework of the Rotwarf‐Taylor model. The picture emerging from the data is consistent with a dynamics governed by high‐frequency phonon (HFP) population, which causes a “bottleneck” effect in the QP recombination.
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