Pseudogap and superconducting gap in YBa{sub 2}Cu{sub 3}O{sub 6+x}: A Raman study

Journal Article · Mon Nov 01 04:00:00 EST 1999 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1023/A:1022513531861· OSTI ID:20012814

Opel, M; Goetzinger, M; Hoffmann, C; Nemetschek, R; Philipp, R; Venturini, F; Hackl, R; Erb, A; Walker, E

The authors present results of electronic Raman-scattering experiments in differently doped YBa{sub 2}Cu{sub 3}O{sub 6+x}. In B{sub 2g} symmetry, an analysis of the data in terms of a memory function approach is presented and dynamical relaxation rates T({omega},T) and mass-enhancement factors 1 + {lambda}({omega},T) for the carriers are obtained. Starting from temperatures T {gt} 180K, T({omega},T) and 1 + {lambda}({omega},T) are extrapolated to lower temperatures and used to re-calculate Raman spectra. By comparison with the data, they find a loss of spectral weight between {Tc} {lt} T {lt} 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.

• Research Organization: Walther-Meissner-Inst., Garching (DE)
• OSTI ID: 20012814
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 117; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
DOPED MATERIALS
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
RAMAN SPECTRA
SUPERCONDUCTIVITY
YTTRIUM OXIDES