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Raman-scattering studies of coupled modes and superconducting gap excitations in single-crystal YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/

Journal Article · · J. Opt. Soc. Am. B: Opt. Phys.; (United States)
; ; ; ; ;
The results of polarized light-scattering studies of single-crystal YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ are presented. In the normal state, strong electronic scattering is observed both directly and through interference effects with certain phonons. Below T/sub c/ this electronic scattering undergoes a redistribution that is due to gap formation. The redistribution of the continuum below T/sub c/ has a strong symmetry dependence, suggesting possible gap anisotropy in YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/. Phonon self-energy effects are also shown to be consistent with gap anisotropy. Finally, studies of untwinned single crystals illustrate striking optical anisotropy of the Raman spectra in the a--b plane.
Research Organization:
Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801
OSTI ID:
6419047
Journal Information:
J. Opt. Soc. Am. B: Opt. Phys.; (United States), Journal Name: J. Opt. Soc. Am. B: Opt. Phys.; (United States) Vol. 6:3; ISSN JOBPD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
ENERGY GAP
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES