Optic breathing mode, resonant charge fluctuations, and high-T/sub c/ superconductivity in the layered perovskites
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
Frozen-phonon optical breathing mode calclations on La/sub 2-//sub x/M/sub x/CuO/sub 4/ (M = Ba,Sr,. . .) demonstrate the following: (i) a large (less than or equal to3 eV/A) electron-phonon interaction matrix element for the dominant Cu d/sub x//sub <2/-y/sup =/: O p/sub x//sub ,//sub y/ orbitals, (ii) a high frequency (--110 meV), and (iii) large charge fluctuations (approx. =0.3 electrons). Especially significant is the possible resonant coupling to, and enhancement of, the natural ground-state Cu/sup 2+/-Cu/sup 3+/ charge fluctuations between in-plane Cu atoms. The relation of these results to the high T/sub c/ (and previous theoretical descriptions of superconductivity) is indicated.
- Research Organization:
- Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60201
- OSTI ID:
- 6511701
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:16; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
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
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
ELECTRONIC STRUCTURE
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
OPTICAL MODES
OSCILLATION MODES
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
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
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON-PHONON COUPLING
ELECTRONIC STRUCTURE
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
OPTICAL MODES
OSCILLATION MODES
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE