Optical Excitations in Insulating CuO{sub 4} Plaquette Networks: Discussion Based on a One Dimensional Mott Insulator Sr{sub 2}CuO{sub 3}

Insulating cuprates become insulator thanks to the strong Coulomb repulsion at Cu d orbitals. They have charge gap between filled oxygen 2p and empty Cu 3d states categorized as charge transfer insulators. Although only Cu 3d and O 2p states are involved in low energy optical transitions, optical ex...

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Bibliographic Details
Published in:AIP conference proceedings 2009-08, Vol.1162 (1)
Main Author: Kim, Kyungwan
Format: Article
Language:English
Subjects:
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHARGE EXCHANGE
COMPARATIVE EVALUATIONS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPOUNDS
COPPER OXIDES
COULOMB FIELD
CRYSTAL MODELS
CUPRATES
D STATES
DIELECTRIC MATERIALS
ELECTRIC FIELDS
ELEMENTS
ENERGY GAP
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVALUATION
EXCITATION
EXCITONS
HUBBARD MODEL
MATERIALS
MATERIALS SCIENCE
MATHEMATICAL MODELS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
QUASI PARTICLES
SPECTRA
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
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Summary:Insulating cuprates become insulator thanks to the strong Coulomb repulsion at Cu d orbitals. They have charge gap between filled oxygen 2p and empty Cu 3d states categorized as charge transfer insulators. Although only Cu 3d and O 2p states are involved in low energy optical transitions, optical excitation spectra of insulating cuprates show rich structures depending on the form of CuO{sub 4} networks. One dimensional chain systems with corner-sharing plaquettes and edge-sharing plaquettes provide basic characters of these transitions. Comparison of available spectra of two dimensional cuprates with one dimensional chain compound Sr{sub 2}CuO{sub 3} suggests that excitonic effect is important in CuO{sub 2} planes.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3225480