Mean-field analysis in the [ital p]-[ital d] model of oxide superconductors

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.1350· OSTI ID:5426382

Ishihara, S; Matsumoto, H; Odashima, S; Tachiki, M ^[1]; Mancini, F ^[2]

---

1. Institute for Materials Research, Tohoku University, Sendai 980 (Japan)
2. Dipartimento di Fisica Teorica SMSA, Universita di Salerno, 84140 Baronissi (Saudi Arabia) (Italy)

A highly correlated [ital p]-[ital d] model of cuprate oxide superconductors is analyzed by use of composite operators on CuO[sub 2] clusters. A minimal set of composite operators to describe the electronic state is identified from the criterion that the order of the approximation is determined by coupling constants multiplied by the weight of their respective operators. It is shown that the intensity transfer among bands with hole doping is well described within the mean-field approximation. Effects of the nearest-neighbor spin correlation are investigated and it is shown that the band dispersions are strongly affected. By the local antiferromagnetic correlation, the band dispersion of the upper Hubbard band is flattened in the whole Brillouin zone, while that of the [ital p] dominant band near the Fermi level is flattened only around a certain region centered at the zone boundary. In the moderately doped region, the Fermi surface is consistent with a large Fermi surface.

• OSTI ID: 5426382
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:2; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

665410* -- Superconductivity-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
CLUSTER MODEL
COPPER COMPOUNDS
COUPLING CONSTANTS
CUPRATES
DOPED MATERIALS
ENERGY LEVELS
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
MAGNETISM
MATERIALS
MATHEMATICAL MODELS
MEAN-FIELD THEORY
NUCLEAR MODELS
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS