Brinkman-Rice transition in layered perovskites

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

DOI:https://doi.org/10.1103/PhysRevB.48.7471· OSTI ID:6023342

Simon, M E; Aligia, A A ^[1]

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1. Centro Atomico Bariloche and Instituto Balseiro, Comision Nacional de Energia Atomica, 8400 S. C. de Bariloche Rio Negro (Argentina)

We consider a one-band model effective Hamiltonian [ital H][sub [ital e][ital f][ital f]] deriv ed previously from the three-band model [ital H] for CuO[sub 2] planes. The parameters of [ital H][sub [ital e][ital f][ital f]] are given in terms of those of [ital H] by a simple prescription. Using [ital H][sub [ital e][ital f][ital f]] and the slave-boson approach of Kotliar and Ruckenstein, we determine the metal-insulator boundary and the magnitude of the charge-transfer gap as a function of the parameters of [ital H]. Our results are in better agreement with experiment than those obtained applying the slave bosons directly to [ital H]. For sufficiently large values of the Cu-O repulsion [ital U][sub [ital p][ital d]], treated in the Hartree-Fock approximation, there is a charge-transfer instability inside the metallic phase, very near the metal-insulator boundary.

• OSTI ID: 6023342
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:10; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
665411 -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALCULATION METHODS
CHARGE EXCHANGE
COPPER COMPOUNDS
CUPRATES
ELECTRONIC STRUCTURE
HARTREE-FOCK METHOD
HIGH-TC SUPERCONDUCTORS
INSTABILITY
OXYGEN COMPOUNDS
PEROVSKITES
PHASE TRANSFORMATIONS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS