Anomalous shifts of oxygen-mode frequencies in La sub 2 minus x Sr sub x CuO sub 4 , YBa sub 2 Cu sub 3 O sub 7 minus. delta. and Tl sub 2 Ba sub 2 Ca sub 1 minus x Gd sub x Cu sub 2 O sub 8

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

OSTI ID:5748501

Mihailovic, D ^[1]; Foster, C M; Voss, K F ^[2]; Mertelj, T; Poberaj, I ^[3]; Herron, N ^[4]

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1. Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara, California 93106 (US) J. Stefan Institute, Jamova 39, Ljubljana, (Yugoslavia)
2. Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara, California 93106 (US)
3. J. Stefan Institute, Jamova 39, Ljubljana, (Yugoslavia)
4. E. I. Du Pont de Nemours, Central Research and Development, Experimental Station, P.O. Box 80328, Wilmington, Delaware 19880-0328 (US)

Comparison of photoinduced local modes (PILM's) of insulating YBa{sub 2}Cu{sub 3}O{sub 6.3} and Tl{sub 2}Ba{sub 2}Ca{sub 1{minus}{ital x}}Gd{sub {ital x}}Cu{sub 2}O{sub 8} with Raman spectra of their metallic counterparts suggests that carrier injection anomalously increases the frequencies of phonons involving {ital z}-axis apex-oxygen motion in both the dilute (insulator) and concentrated (metallic) limit. In La{sub 2}CuO{sub 4}, we observe PILM's whose frequencies suggest a correspondence with the ghost modes'' observed in neutron scattering (Rietschel {ital et} {ital 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.

• OSTI ID: 5748501
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 44:1; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ABSORPTION SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
COPPER COMPOUNDS
CUPRATES
HIGH-TC SUPERCONDUCTORS
INFRARED SPECTRA
LANTHANUM COMPOUNDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
POLARONS
QUASI PARTICLES
QUATERNARY COMPOUNDS
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SPECTRA
SPECTROSCOPY
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS