Phonon characterization of YBa/sub 2/(Cu/sub 1-//sub x/Al/sub x/)/sub 3/O/sub 7//sub -//sub delta/ by Raman spectroscopy
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
We present new Raman scattering data on high-temperature superconducting materials with composition YBa/sub 2/(Cu/sub 1-//sub x/Al/sub x/)/sub 3/O/sub 7//sub -//sub delta/. In YBa/sub 2/Cu/sub 3//sub 7-//sub delta/ we observe new high-frequency peaks greater than 700 cm/sup -1/ that we associate with two phonon interactions of the first-order Cu-O Raman vibrations that occur at 337, (450 +- 10) and 502 cm/sup -1/. The intensity of these new peaks suggest that anomalous phonon interactions are taking place. Results on Al substitution are consistent with a unit-cell change from orthorhombic to tetragonal. The observation of superconductivity in the tetragonal structure means that it is not possible to simply assign superconductivity to the orthorhombic structure.
- Research Organization:
- GEC Research Limited, Hirst Research Centre, East Lane, Wembley, Middlesex HA9 7PP, United Kingdom
- OSTI ID:
- 5679816
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:16; ISSN PRBMD
- 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
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
SUPERCONDUCTIVITY
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
RAMAN SPECTRA
SPECTRA
SUPERCONDUCTIVITY
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES