Theory for the electronic structure of high-[ital T][sub [ital c]] superconductors

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.3983· OSTI ID:6324880

Baumgaertel, G; Schmalian, J; Bennemann, K ^[1]

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1. Institute for Theoretical Physics, Freie Universitaet Berlin, Arnimallee 14, 1000 Berlin 33 (Germany)

Using a three-band Hubbard Hamiltonian within a slave-boson mean-field approximation we determine the doping dependence of the density of states in the CuO[sub 2] planes. We analyze in detail the occurrence of local magnetic moments, their effects on the electronic structure, and the insulating state resulting from a charge transfer or a Mott-Hubbard gap. This theory permits a treatment of highly correlated systems over the whole doping range and thus of the transition from local moment to fully itinerant behavior. Using the density of states various magnetic, spectroscopic, and transport properties are calculated. Our analysis sheds light on the difference of electron versus hole doping and in particular on the doping dependence of the Cu-O singlet and the Hall coefficient. More generally, by comparing with experimental data and theoretical results obtained by alternative methods one learns more about the validity of the slave-boson mean-field theory. We also discuss how the theory can be extended to include quantum fluctuations.

• OSTI ID: 6324880
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:6; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPOUNDS
CRYSTAL MODELS
CUPRATES
DOPED MATERIALS
ELECTRONIC STRUCTURE
ENERGY GAP
ENERGY-LEVEL DENSITY
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
MATERIALS
MATHEMATICAL MODELS
MEAN-FIELD THEORY
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VARIATIONS