Physics – Condensed Matter – Superconductivity
Scientific paper
1999-02-17
Physics
Condensed Matter
Superconductivity
15 pages, to be published in "Spectroscopy of Superconducting Materials", ACS Symposium Series Volume 730, 1999, Ed. E. Faulqu
Scientific paper
Ultrafast time-resolved optical spectroscopy in high-temperature superconductors enables the direct real-time measurement of non-equilibrium quasiparticle recombination dynamics. In addition, it also gives detailed information about the symmetry of the superconducting gap and the "pseudogap", their doping dependence and their temperature dependence. Experimental data, together with theoretical models on the photoinduced transmission amplitude and relaxation time as a function of temperature and doping in YBa2Cu3O7-d gives a consistent picture of the evolution of low-energy structure, where a temperature-independent gap is shown to exist in the underdoped state which evolves with doping into a two-component state near optimum doping, where the dominant response is from a T-dependent BCS-like superconducting gap.
Demsar Jure
Mihailovic Dragan
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