Raman study of pure and doped (Li,Sr) single crystals of La/sub 2/CuO/sub 4-//sub y/
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
Raman spectra are presented of pristine and doped (Sr,Li) single crystals of La/sub 2/CuO/sub 4-//sub y/. Based on polarization measurements, we assign the 424-cm/sup -1/ line to the symmetric A/sub 1//sub g/ vibration of the out-of-plane oxygen atoms along the tetragonal axis. The line at 231 cm/sup -1/ is identified as the A/sub 1//sub g/ vibration of the La atoms along the tetragonal axis and the line at 238 cm/sup -1/ as the E/sub g/ vibration of the out-of-plane oxygen atoms parallel to the Cu-O layers. A symmetry-forbidden Raman line is observed at 680 cm/sup -1/ which, by comparison with infrared measurements, can be tentatively assigned to an in-plane oxygen vibration. The dependence of the Raman spectra upon Li and Sr doping is presented and discussed. Especially noteworthy are two strong and sharp Raman lines (at 757 and 773 cm/sup -1/ at room temperature) in the Sr-doped crystals, because of their higher frequencies, polarization sensitivities, and unusual temperature dependences.
- Research Organization:
- Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
- OSTI ID:
- 6757560
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:4; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DOPED MATERIALS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LITHIUM ADDITIONS
LITHIUM ALLOYS
MATERIALS
MEDIUM TEMPERATURE
MONOCRYSTALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLARIZATION
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SPACE GROUPS
SPECTRA
STRONTIUM ADDITIONS
STRONTIUM ALLOYS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VIBRATIONAL STATES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DOPED MATERIALS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LITHIUM ADDITIONS
LITHIUM ALLOYS
MATERIALS
MEDIUM TEMPERATURE
MONOCRYSTALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLARIZATION
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SPACE GROUPS
SPECTRA
STRONTIUM ADDITIONS
STRONTIUM ALLOYS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
VIBRATIONAL STATES