High-temperature Raman measurements of single-crystal YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/

Journal Article · Mon Aug 01 00:00:00 EDT 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.2914· OSTI ID:6926756

McCarty, K F; Hamilton, J C; Shelton, R N; Ginley, D S

We report in situ Raman spectra from single-crystal YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ in oxygen at temperatures from 20 to 770 /sup 0/C and from YBa/sub 2/Cu/sub 3/O/sub 6.2/ in argon at temperatures from 20 to 545 /sup 0/C. For YBa/sub 2/Cu/sub 3/O/sub 7-//sub x/ in oxygen, a defect-induced phonon at approx.570 cm/sup -1/ appears above approx.500 /sup 0/C and increases in intensity with increasing temperature and loss of oxygen. As YBa/sub 2/Cu/sub 3/O/sub 6.2/ is heated above approx.100 /sup 0/C, dramatic changes occur in the phonon bands, resulting from three-dimensional reorganization (disordering) of the oxygen in the structure involving the formation of oxygen vacancies at the O(4) sites.

• Research Organization: Sandia National Laboratories, Livermore, California 94550
• OSTI ID: 6926756
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:4; ISSN PRBMD
• Country of Publication: United States
• Language: English

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
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
HIGH TEMPERATURE
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHONONS
POINT DEFECTS
QUANTITY RATIO
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VACANCIES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES