Nearest-neighbor repulsion in electron-doped high-temperature cuprate superconductors
A. J. Fedro, H.-B. Schüttler
DOI 10.1103/PhysRevB.40.5155 · Physical Review B
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Abstract
We present results of a strong-coupling expansion of the three-orbital Hubbard model describing motion of holes in the copper system where, in the electron-doped case, the number of holes per Cu site is less than or equal to one. The resulting strong-coupling Hamiltonian is Hubbard-like but with an additional nearest-neighbor repulsion between Cu holes due to the presence of the Cu-O intersite V term. We find, using the model parameters estimated by Hybersten et al., that this repulsive interaction generated by the V term is of the same order as that of the possible spin-fluctuation-mediated attractive interaction between Cu sites so that nearest-neighbor quasiparticle pairing is significantly suppressed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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