Photoinduced self-localized structural distortions in YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
Photoinduced absorption measurements of YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ (delta = 0.75) from 150 to 4000 cm/sup -1/ are reported. We observed photoinduced infrared-active vibrational modes, associated phonon bleachings, and an electronic transition from a self-localized gap state. The results indicate a local tetragonal to orthorhombic distortion around the charge carriers. The dynamic mass associated with the distortion is smaller in YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ than in La/sub 2/CuO/sub 4/. The photoinduced structural distortion and the associated self-localized gap state demonstrate that the photoexcitations are polarons or bipolarons. Since these photoinduced absorption features are not observed in the isostructural compound La/sub 2/NiO/sub 4/ we conclude that polaron (or bipolaron) formation may play an important role in the high-temperature superconductivity.
- Research Organization:
- Department of Physics, Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara, California 93106
- OSTI ID:
- 6781749
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:10; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Absorption and photoinduced-absorption spectroscopy in semiconducting YBa sub 2 Cu sub 3 O sub 6+ x
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Sat Apr 30 20:00:00 EDT 1988
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OSTI ID:6743903
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Absorption and photoinduced-absorption spectroscopy in semiconducting YBa sub 2 Cu sub 3 O sub 6+ x
Journal Article
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Wed May 01 00:00:00 EDT 1991
· Physical Review, B: Condensed Matter; (USA)
·
OSTI ID:5689628
Related Subjects
36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHARGE CARRIERS
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
ELECTRONIC STRUCTURE
ENERGY GAP
INFRARED SPECTRA
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POLARONS
QUASI PARTICLES
RADIATION EFFECTS
SPECTRA
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHARGE CARRIERS
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
ELECTRONIC STRUCTURE
ENERGY GAP
INFRARED SPECTRA
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POLARONS
QUASI PARTICLES
RADIATION EFFECTS
SPECTRA
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES