Raman-active phonons of a twin-free YBa sub 2 Cu sub 3 O sub 7 crystal: A complete polarization analysis
Journal Article
·
· Physical Review, B: Condensed Matter; (USA)
- Sandia National Laboratories, Livermore, California 94551 (USA)
- Department of Physics, University of California-Davis, Davis, California 95616 (USA)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (USA)
A complete Raman analysis has been performed on a high-quality YBa{sub 2}Cu{sub 3}O{sub 7} crystal made free of twins by a mechanical detwinning process. Marked {ital a}-{ital b} anisotropy is observed in the intensity of the {ital A}{sub {ital g}} phonons at 116, 335, and 495 cm{sup {minus}1}. At room temperature, the {alpha}{sub {ital y}{ital y}} component of the polarizability tensor of the 116-cm{sup {minus}1} phonon is strongly coupled to an electronic continuum, the {alpha}{sub {ital x}{ital x}} component is less strongly coupled, and the coupling of the {alpha}{sub {ital z}{ital z}} component is not apparent in the Raman line shape. {ital B}{sub 2{ital g}} and {ital B}{sub 3{ital g}} phonon pairs are reproducibly found at 70 and 83 cm{sup {minus}1}, 142 and 140 cm{sup {minus}1}, 210 and 303 cm{sup {minus}1}, and 579 and 526 cm{sup {minus}1}. Comparison of the observed {ital B}{sub 2{ital g}}-{ital B}{sub 3{ital g}} pairs to literature calculations of frequencies is made.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6883926
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:13; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
MONOCRYSTALS
OSCILLATION MODES
OXIDES
OXYGEN COMPOUNDS
PHONONS
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TWINNING
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
MONOCRYSTALS
OSCILLATION MODES
OXIDES
OXYGEN COMPOUNDS
PHONONS
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
TWINNING
YTTRIUM COMPOUNDS
YTTRIUM OXIDES