Quasi-particles dynamics in underdoped Bi2212 under strong optical perturbation.

Claudio Giannetti, Gabriele Ferrini, Giacomo Coslovich, Federico Cilento, Fulvio Parmigiani

Risultato della ricerca: Contributo in rivistaArticolo in rivista

Abstract

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 (10<<600 µJ/cm2). 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 (~70 µJ/cm2). Numerical simulations of the heat diffusion problem indicate that, in this regime, the local temperature of the sample is lower than TC, confirming the impulsive nature of this phenomenon. The quasi-particles (QP) dynamics in the strongly perturbed superconducting state (10<<70 µJ/cm2) 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
Lingua originaleEnglish
pagine (da-a)177-185
Numero di pagine9
RivistaAIP Conference Proceedings
Volume1162
DOI
Stato di pubblicazionePubblicato - 2009

Keywords

  • dynamics
  • superconductors

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