Superexchange, hole-hole interactions, and oxygen spin dynamics in high-[ital T][sub [ital c]] superconductors

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

DOI:https://doi.org/10.1103/PhysRevB.50.16649· OSTI ID:6937894

Barriquand, F; Sawatzky, G A ^[1]

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1. Materials Science Centre, Department of Solid State and Applied Physics, University of Groningen, Nijenborgh 4, 9747AG Groningen (Netherlands)

A contribution to superexchange coming from empty oxygen orbitals is pointed out. We also estimate the small anisotropy of the in-plane superexchange, as well as the superexchange between two adjacent layers in the specific YBa[sub 2]Cu[sub 3]O[sub 6] compound. In doped compounds, we improve the description of the transport properties of Zhang-Rice singlets over the simple [ital t]-[ital J] model. Particularly important for the bandwidth is the role of what we call [ital t][sub unequal spins][sup [prime]] and [ital t][sub unequal spins][sup m] . When more than one doped hole is present in the system, the interaction between holes becomes rapidly non-negligible: two Zhang-Rice singlets placed on neighboring cells highly [ital repel] each other. Some aspects of oxygen spin dynamics are discussed, in connection with NMR experiments.

• OSTI ID: 6937894
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:22; 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
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRONIC STRUCTURE
ELEMENTS
EXCHANGE INTERACTIONS
HIGH-TC SUPERCONDUCTORS
HOLES
INTERACTIONS
MATHEMATICAL MODELS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES