Raman study of the coupling of crystal-field excitations to phonons in NdBa sub 2 Cu sub 3 O sub 7 minus. delta
Journal Article
·
· Physical Review, B: Condensed Matter; (United States)
- Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-7000 Stuttgart 80 (Germany)
A double peak observed near 300 cm{sup {minus}1} in the Raman and inelastic-neutron-scattering spectra of the high-{ital T}{sub {ital c}} superconductor NdBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} is due to a strong coupling and mixing of the {ital B}{sub 1{ital g}}-symmetry Raman phonon and crystal-field (CF) excitations of the Nd{sup 3+} 4{ital f} electrons of the same symmetry. In this paper, we describe in detail a model based on the coupling of extended phonons and localized CF excitations. Higher phonon quantum numbers have to be taken into account at room temperature. We show that this interpretation is compatible with measurements of the dependence on temperature, oxygen isotopic substitution, laser wavelength, and oxygen content. We obtain from our model the CF-phonon coupling constant as well as the frequencies of the unperturbed phonon and CF excitation. We also discuss the breaking of the polarization selection rules for the highest phonon based on the substitution of Ba by Nd ions.
- OSTI ID:
- 6222295
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:18; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
665411 -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM IONS
BARIUM OXIDES
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
COUPLING CONSTANTS
CRYSTAL FIELD
CUPRATES
ELECTRON-PHONON COUPLING
ENERGY-LEVEL TRANSITIONS
EXCITATION
HIGH-TC SUPERCONDUCTORS
IONS
NEODYMIUM COMPOUNDS
NEODYMIUM IONS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
POLARIZATION
RAMAN EFFECT
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SPECTRA
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
665411 -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM IONS
BARIUM OXIDES
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
COUPLING CONSTANTS
CRYSTAL FIELD
CUPRATES
ELECTRON-PHONON COUPLING
ENERGY-LEVEL TRANSITIONS
EXCITATION
HIGH-TC SUPERCONDUCTORS
IONS
NEODYMIUM COMPOUNDS
NEODYMIUM IONS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
POLARIZATION
RAMAN EFFECT
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SPECTRA
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS