Electronic structure and hole-hole coupling in YBa sub 2 Cu sub 3 O sub 7 minus x systems
- Departamento de Fisica, Grupo de Electromagnetismo, Universidad Autonoma de Barcelona, Bellaterra, Barcelona (Spain)
The electronic structure of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} for {ital x}=0, has been determined by means of an approximation to the self-energy for Hubbard systems with two channels for the localization ({ital p} and {ital d}). This self-energy contains the unrestricted Hartree-Fock terms and the dynamically screened exchange. The calculated electronic structure presents a different ionization state for the atoms of the CuO{sub 2} sheets with respect to the CuO{sub 3} chain. For increasing {ital x} values, electron transferences between O-O, Cu-Cu, and Cu-O atoms are produced. These electronic transferences provide holes to the CuO{sub 2} sheets in symmetries {ital d}{sub {ital x}{sup 2}{minus}{ital y}{sup 2}} of Cu(2) and {ital p}{sub {ital x}} and {ital p}{sub {ital y}} of O(2) and O(3). These holes suffer interatomic screening, which produces coupling for determined densities of holes and widths of the bands. The main parameter for obtaining superconductivity is the lower limit of the frequency interval for which the interatomic {ital W}{sub {ital p}{ital d}}({omega}) is negative. This frequency has to be sufficiently less than a critical cutoff frequency. We discuss the conditions of the electronic structure for obtaining high-{Tc} superconductivity.
- OSTI ID:
- 6436938
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Vol. 42:7; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
ELECTRONIC STRUCTURE
COPPER OXIDES
YTTRIUM OXIDES
HOLES
SELF-ENERGY
TRANSITION TEMPERATURE
VALENCE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ENERGY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties