Resonant Raman study of superconducting gap and electron-phonon coupling in YbBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}

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

DOI:https://doi.org/10.1023/A:1022590221383· OSTI ID:20012827

Ostertun, S; Kiltz, J; Wolf, T; Bock, A

The authors investigate the electronic background as well as the 02-03 mode at 330 cm{sup {minus}1} of highly doped YbBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} in B{sub 1g} symmetry. Above the critical temperature {Tc} the spectra consist of an almost constant electronic background and superimposed phononic excitations. Below {Tc} the superconducting gap opens and the electronic background redistributes exhibiting a 2{Delta} peak at 320 cm{sup {minus}1}. They use a model that allows them to separate the background from the phonon. In this model the phonon intensity is assigned to the coupling of the phonon to inter- and intraband electronic excitations. For excitation energies between 1.96 eV and 2.71 eV the electronic background exhibits hardly any resonance. Accordingly, the intraband contribution to the phonon intensity is not affected. In contrast, the interband contribution vanishes below {Tc} at 1.96 eV while it remains almost unaffected at 2.71 eV.

• Research Organization: Inst. fur Angewandte Physik, Hamburg (DE)
• OSTI ID: 20012827
• 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
ELECTRON-PHONON COUPLING
ENERGY GAP
MATHEMATICAL MODELS
RAMAN SPECTRA
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE
YTTERBIUM OXIDES