Dependence of the polarizability of the Cu sub 4 O sub 8 cluster on the doping, the weight of the oxygen-hole state, and the excitation gaps in the three-band Hubbard model
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India)
We have obtained the model exact static polarizability of the Cu{sub 4}O{sub 8} cluster within the three-band Hubbard model for different doping levels. The excitation gaps as well as the weight of the O{sup {minus}} (oxygen-hole) state in the ground-state wave function have been exactly computed. The parameters of the model are varied to alter the excitation gaps as well as the weight of the O{sup {minus}} state in order to examine the dependence of the polarizability on these quantities. The Cu{sub 4}O{sub 8} cluster is highly polarizable, the polarizability increasing with the doping level. The polarizability is large when the excitation gap is charge-transfer-like and increases with the decreasing gap; it also increases markedly with the increase in the weight of the O{sup {minus}} state. Experimentally, the {ital T}{sub {ital c}} in the cuprates is highest for the range of the weight of O{sup {minus}} for which the lattice is highly polarizable.
- OSTI ID:
- 5156131
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 44:13; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER OXIDES
POLARIZABILITY
TRANSITION TEMPERATURE
HIGH-TC SUPERCONDUCTORS
COORDINATION VALENCES
COVALENCE
CRYSTAL DOPING
EXCITED STATES
GROUND STATES
OXYGEN IONS
PEROVSKITES
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
ENERGY LEVELS
IONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VALENCE
360204* - Ceramics
Cermets
& Refractories- Physical Properties