Coupling of phonons to crystal-field excitations in NdBa sub 2 Cu sub 3 O sub 7 minus. delta
Journal Article
·
· Physical Review Letters; (USA)
- Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstrasse 1, D-7000 Stuttgart 80, Germany (DE)
We demonstrate the existence of a coupled elementary excitation involving a phonon and a Nd{sup 3+} 4{ital f}-electron crystal-field excitation in the high-{ital T}{sub {ital c}} superconductor NdBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. It explains in a natural way the recent observation of a double-peak structure in the Raman spectra as well as in the inelastic neutron scattering spectra near 300 cm{sup {minus}1} at low temperature. Our assignment is supported by measurements of the dependence of this feature on temperature, isotopic substitution, and polarization. A model based on strong coupling of extended phonon states to localized crystal-field excitations describes the observed behavior well.
- OSTI ID:
- 5554365
- Journal Information:
- Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 67:1; ISSN PRLTA; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL FIELD
CRYSTALS
ELECTRON-PHONON COUPLING
HIGH-TC SUPERCONDUCTORS
MONOCRYSTALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHONONS
POLARIZATION
QUASI PARTICLES
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SPECTRA
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL FIELD
CRYSTALS
ELECTRON-PHONON COUPLING
HIGH-TC SUPERCONDUCTORS
MONOCRYSTALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHONONS
POLARIZATION
QUASI PARTICLES
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SPECTRA
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
ULTRALOW TEMPERATURE