Raman spectrum of the superconductor Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/
Two Raman setups, one with high resolution, and the other for spatially resolved (1 x 1 ..mu..m/sup 2/) experiments, have been used to investigate the polarized Raman spectra of a superconducting single crystal of the (2:2:1:2) phase Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8/, and the unpolarized micro-Raman spectra of three ceramics, two of which have zero resistance below approx.105 K and contain substantial proportions of the (2:2:2:3) phase (approx.15--20%). Our spectra differ in some aspects from those recently published for the (2:2:1:2) phase. The occurence of several low-frequency lines (vless than or equal to65 cm/sup -1/) is confirmed. The width of the lines and their shape is discussed with regard to the occurence of disorder in the structure and of an electron-phonon coupling. The spectra of the ceramics reveal the presence of four minority phases in addition to the main phases (2:2:1:2) and (2:2:2:3). The ceramics containing the (2:2:2:3) phase display the same lines as the ceramic not containing this phase. This result is discussed in the light of the structural information available and of the grain-growth habit of the (2:2:1:2) phase.
- Research Organization:
- Centre National d'Etudes des Telecommunications, 196 rue Henri Ravera 92220, Bagneux, France
- OSTI ID:
- 6757334
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 39:1
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BISMUTH OXIDES
RAMAN SPECTRA
CALCIUM OXIDES
COPPER OXIDES
STRONTIUM OXIDES
ELECTRON-PHONON COUPLING
LINE WIDTHS
MONOCRYSTALS
POLARIZATION
SUPERCONDUCTORS
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SPECTRA
STRONTIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity