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Journal of Low Temperature Physics

, Volume 117, Issue 3–4, pp 347–351 | Cite as

Pseudogap and Superconducting Gap in YBa2Cu3o6+x: A Raman Study

  • Matthias Opel
  • Martin Götzinger
  • Christian Hoffmann
  • Ralf Nemetschek
  • Richard Philipp
  • Francesca Venturini
  • Rudi Hackl
  • Andreas Erb
  • Eric Walker
Article

Abstract

We present results of electronic Raman-scattering experiments in differently doped YBa 2 Cu 3 O 6+x . In B 2g 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 T c < T < T* at all doping levels x. T* is comparable to the pseudogap temperature found in other experiments. Below T c , the superconducting gap is observed. It depends on x and scales with T c whereas the energy scale of the pseudogap remains the same.

Keywords

Raman Spectrum Magnetic Material Relaxation Rate Energy Scale Doping Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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REFERENCES

  1. 1.
    A. Erb, E. Walker, J.-Y. Genoud, and R. Flükiger, Physica C 282–287, 89 (1997).Google Scholar
  2. 2.
    For a review see: T. Timusk and B.W. Statt, Rep. Prog. Phys. 62, 61-122 (1999).Google Scholar
  3. 3.
    R. Hackl, M. Opel, P.F. Müller, G. Krug, B. Stadlober, R. Nemetschek, H. Berger, and L. Forró, J. Low Temp. Phys. 105, 733 (1996).Google Scholar
  4. 4.
    W. Götze and P. Wölfle, Phys. Rev. B 6, 1226 (1972).Google Scholar
  5. 5.
    R. Nemetschek, M. Opel, C. Hoffmann, P.F. Müller, R. Hackl, H. Berger, L. Forró, A. Erb, and E. Walker, Phys. Rev. Lett. 78, 4837 (1997).Google Scholar
  6. 6.
    J.G. Naeini, X.-K. Chen, J.C. Irwin, M. Okuya, T. Kimura, and K. Kishio, Phys. Rev. B 59, 9642 (1999).Google Scholar

Copyright information

© Plenum Publishing Corporation 1999

Authors and Affiliations

  • Matthias Opel
    • 1
  • Martin Götzinger
    • 1
  • Christian Hoffmann
    • 1
  • Ralf Nemetschek
    • 1
  • Richard Philipp
    • 1
  • Francesca Venturini
    • 1
  • Rudi Hackl
    • 1
  • Andreas Erb
    • 1
    • 2
  • Eric Walker
    • 1
    • 2
  1. 1.Walther–Meissner–InstitutGarchingGermany
  2. 2.DPMCUniversité de GenèveGenèveSwitzerland

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