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Title: Pseudogap and superconducting gap in YBa2Cu3o6+x : a raman study
Authors : Opel, M.
Götzinger, M.
Hoffmann, C.
Nemetschek, R.
Philipp, R.
Venturini, Francesca
Hackl, R.
Erb, A.
Walker, E.
Published in : Journal of Low Temperature Physics
Volume(Issue) : 117
Issue : 3-4
Pages : 347
Pages to: 351
Publisher / Ed. Institution : Kluwer
Issue Date: 1999
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Raman spectrum; Magnetic material; Relaxation rate; Energy scale; Doping level
Subject (DDC) : 530: Physics
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.
Further description : Erworben im Rahmen der Schweizer Nationallizenzen (http://www.nationallizenzench.)
Departement: School of Engineering
Organisational Unit: Institute of Applied Mathematics and Physics (IAMP)
Publication type: Article in scientific Journal
DOI : 10.1023/A:1022513531861
ISSN: 0022-2291
Appears in Collections:Publikationen School of Engineering

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