Correlations and insulating state in La sub 2 CuO sub 4

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.4033· OSTI ID:6861854

Cyrot, M ^[1]; Mayou, D ^[2]

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1. Laboratoire Louis Neel, 25 avenue des Martyrs, 38042 Grenoble CEDEX, France (FR)
2. Laboratoire d'Etudes des Proprietes Electroniques des Solides, 25 avenue des Martyrs, 38042 Grenoble CEDEX, France (FR)

For high-{Tc} superconductors La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4}, most authors now agree on the importance of the intra-atomic Coulomb repulsion {ital U} on the copper sites. Thus starting with a band made from the {ital d}{sub {ital x}{sup 2}{minus}{ital y}{sup 2}} state of copper and {ital p}{sub {sigma}} state of oxygen, we include this repulsion for both copper and oxygen atomic states. We describe the Gutzwiller approximation appropriate to this two-site Hubbard Hamiltonian. We show that for large values of {ital U} the intra-atomic Coulomb repulsion and {Delta} ({Delta} being the difference in energy between the copper {ital d} state and oxygen {ital p} state), we get a Hubbard-type splitting of the antibonding band which leads to an insulating state for the undoped compounds even for the nonmagnetic state ({ital T}{gt}{ital T}{sub {ital N}}).

• OSTI ID: 6861854
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:7; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COULOMB FIELD
D STATES
ELECTRIC CONDUCTIVITY
ELECTRIC CONDUCTORS
ELECTRIC FIELDS
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
ENERGY LEVELS
EQUIPMENT
HAMILTONIANS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MATHEMATICAL OPERATORS
NEEL TEMPERATURE
OXIDES
OXYGEN COMPOUNDS
P STATES
PEROVSKITES
PHYSICAL PROPERTIES
QUANTUM OPERATORS
RARE EARTH COMPOUNDS
STOICHIOMETRY
STRONTIUM ADDITIONS
STRONTIUM ALLOYS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE