Optical-phonon study of single crystals of various layered cuprates and related materials: Evidence of unique electron-phonon coupling in the CuO sub 2 plane

Journal Article · Wed May 01 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.10496· OSTI ID:5809844

Tajima, S ^[1]; Ido, T; Ishibashi, S; Itoh, T; Eisaki, H ^[2]; Mizuo, Y ^[3]; Arima, T ^[4]; Takagi, H; Uchida, S ^[2]

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1. Superconductivity Research Laboratory, ISTEC, Shinonome 1-10-13, Tokyo 135, Japan (JP)
2. Department of Applied Physics, The University of Tokyo, Hongo 7-3-1, Tokyo 113, Japan (JP)
3. Department of Physics, Tokai University, Kitakaname 1117, Hiratsuka 259-12, Japan (JP)
4. Department of Physics, The University of Tokyo, Hongo 7-3-1, Tokyo 113, Japan (JP)

Optical-phonon spectra were investigated for single crystals of the parent materials of various cuprate superconductors and related materials. Comparing the spectra, all the observed phonons were unambiguously assigned. It was found that the main phonon modes in the CuO{sub 2} plane, the Cu-O stretching and bending modes, exhibit completely different dependences of their frequency on the Cu-O bond distance {ital a}/2; that is, the former shows strong {ital a} dependence while the latter is relatively insensitive to {ital a}. From a quantitative analysis of the spectra, the highly covalent character of these layered cuprates was confirmed. The remarkable change of the stretching-mode frequency against {ital a} indicates a direct coupling of this phonon with the Cu-O charge-transfer electronic excitation.

• OSTI ID: 5809844
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
PHONONS
CALCIUM OXIDES
COPPER OXIDES
LANTHANUM OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
BOND LENGTHS
CHARGE EXCHANGE
COUPLING
ELECTRONS
HIGH-TC SUPERCONDUCTORS
MONOCRYSTALS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
DIMENSIONS
ELEMENTARY PARTICLES
FERMIONS
LANTHANUM COMPOUNDS
LENGTH
LEPTONS
OXIDES
OXYGEN COMPOUNDS
QUASI PARTICLES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties