Published July 1, 1991
| Version v1
Journal article
Anomalous shifts of oxygen-mode frequencies in La2-xSrxCuO4, YBa2Cu3O7-δ and Tl2Ba2Ca1-xGdxCu2O8
- 1. J. Stefan Institute, Jamova 39, Ljubljana, (Yugoslavia)
- 2. Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara, California 93106 (USA)
- 3. E. I. Du Pont de Nemours, Central Research and Development, Experimental Station, P.O. Box 80328, Wilmington, Delaware 19880-0328 (USA)
Description
Comparison of photoinduced local modes (PILM's) of insulating YBa2Cu3O6.3 and Tl2Ba2Ca1-xGdxCu2O8 with Raman spectra of their metallic counterparts suggests that carrier injection anomalously increases the frequencies of phonons involving z-axis apex-oxygen motion in both the dilute (insulator) and concentrated (metallic) limit. In La2CuO4, we observe PILM's whose frequencies suggest a correspondence with the ''ghost modes'' observed in neutron scattering [Rietschel et al., Physica C 162--164, 1705 (1989)]. These data, together with Raman data on apex-oxygen anharmonicity, enable us to discuss the vibronic mode couplings involved in polaron formation in the three materials
Additional details
Publishing Information
- Journal Title
- Physical Review, B: Condensed Matter
- Journal Volume
- 44
- Journal Issue
- 1
- Series
- Phys. Rev., B: Condens. Matter.
- Journal Page Range
- 237-241
- ISSN
- 0163-1829
- CODEN
- PRBMD
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 22068607
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ABSORPTION SPECTROSCOPY; BARIUM COMPOUNDS; CUPRATES; HIGH-TC SUPERCONDUCTORS; INFRARED SPECTRA; LANTHANUM COMPOUNDS; POLARONS; QUATERNARY COMPOUNDS; RAMAN SPECTRA; STRONTIUM COMPOUNDS; YTTRIUM COMPOUNDS
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; AMINES; COPPER COMPOUNDS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; QUASI PARTICLES; RARE EARTH COMPOUNDS; SPECTRA; SPECTROSCOPY; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS