Electron-phonon coupling in superconducting Ba/sub 0. 6/K/sub 0. 4/BiO/sub 3/: A Raman scattering study
Superconducting and nonsuperconducting phases in the Ba/sub 1/minus//ital x//K/sub /ital x//BiO/sub 3/ system have been studied at temperatures down to 4 K by use of Raman spectroscopy. For superconducting Ba/sub 0.6/K/sub 0.4/BiO/sub 3/, an optical phonon at 348 cm/sup /minus/1/ (43 meV) has the distinctive Fano line shape indicative of significant coupling between the phonon and a broad electronic continuum. For nonsuperconducting Ba/sub 0.8/K/sub 0.2/BiO/sub 3/, the same phonon is not observed to be coupled to the electronic states. Assignment ofthe 348-cm/sup /minus/1/ peak to specific normal modes of vibration is discussed as is the similarity to the phonon at 340 cm/sup /minus/1/ in YBa/sub 2/Cu/sub 3/O/sub 7/ that also exhibit selectron-phonon coupling.
- Research Organization:
- Sandia National Laboratories, Livermore, California 94551 (US); Lawrence Livermore National Laboratory, Livermore, California 94550; Argonne National Laboratory, Argonne, Illinois 60439; Department of Physics, University of California-Davis, Davis, California 95616
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5916289
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 40:4; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
LASER SPECTROSCOPY
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHONONS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
QUASI PARTICLES
RAMAN SPECTROSCOPY
SPECTROSCOPY
SUPERCONDUCTIVITY