Two-band singlet-hole model for the copper oxide plane

Journal Article · Thu Jun 15 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.51.16599· OSTI ID:69475

Plakida, N M ^[1]; Hayn, R ^[2]; Richard, J ^[3]

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1. Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)
2. Max-Planck-Arbeitsgruppe ``Elektronensysteme,`` Technische Universitaet Dresden, Mommsenstrasse 13, 01069 Dresden (Germany)
3. Centre de Physique Theorique, F-13288 Marseille Cedex 9 (France)

An effective Hubbard model for one-hole {ital d}-like states and two-hole singlet states is derived from the original {ital p}-{ital d} model to describe the low-energy electronic spectrum of the CuO{sub 2} plane in cuprates. By using the projection technique for the two-time matrix Green`s function in terms of Hubbard operators a two-band spectrum for {ital d}-like holes and singlets as well as the density of states is calculated. It is found that the hybridization between {ital d}-like holes and singlets results in a substantial renormalization of the spectrum. In addition, the dispersion relation depends strongly on the antiferromagnetic short-range spin correlations in the spin-singlet state: For large spin correlations at small doping values one finds a next-nearest-neighbor dispersion. With doping, by decreasing the spin correlations, the dispersion changes to an ordinary nearest-neighbor one.

• OSTI ID: 69475
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 23 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANTIFERROMAGNETISM
BAND THEORY
CUPRATES
D STATES
ELECTRIC CONDUCTIVITY
ELECTRONIC STRUCTURE
GREEN FUNCTION
HAMILTONIANS
HIGH-TC SUPERCONDUCTORS
HOLES
HUBBARD MODEL
P STATES
PARAMAGNETISM