We present results of electronic Raman-scattering experiments in differently doped Y-123. In B2g symmetry, an analysis of the data in terms of a memory function approach is presented and dynamical relaxation rates Γ(ω,T) and mass-enhancement factors 1+λ(ω,T) for the carriers are obtained. Starting from temperatures T > 180K, Γ(ω,T) and 1+λ(ω,T) are extrapolated to lower temperatures and used to re-calculate Raman spectra. By comparison with our data, we find a loss of spectral weight between Tc < T < T* at all doping levels x. T* is comparable to the pseudogap temperature found in other experiments. Below Tc, the superconducting gap is observed. It depends on x and scales with Tc whereas the energy scale of the pseudogap remains the same.
@article{arxiv.cond-mat/9906446,
title = {Pseudogap and Superconducting Gap in Y-123: A Raman Study},
author = {Matthias Opel and Martin Götzinger and Christian Hoffmann and Ralf Nemetschek and Richard Philipp and Francesca Venturini and Rudi Hackl and Andreas Erb and Eric Walker},
journal= {arXiv preprint arXiv:cond-mat/9906446},
year = {2015}
}
Comments
5 pages, 5 EPS figures; MOS'99 Proceedings to appear in J. Low Temp. Phys