Superexchange, hole-hole interactions, and oxygen spin dynamics in high-Tc superconductors

F. Barriquand; G. A. Sawatzky

doi:10.1103/PhysRevB.50.16649

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Superexchange, hole-hole interactions, and oxygen spin dynamics in high-Tc superconductors

F. Barriquand, G. A. Sawatzky

DOI 10.1103/PhysRevB.50.16649 · Physical Review B

T1

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Abstract

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 YBa2Cu3O6 compound. In doped compounds, we improve the description of the transport properties of Zhang-Rice singlets over the simple t-J model. Particularly important for the bandwidth is the role of what we call tunequalspins′ and tunequalspins″. 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 repel each other. Some aspects of oxygen spin dynamics are discussed, in connection with NMR experiments.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown