Dependence of the transition temperature on deviations from stoichiometry in the cuprate superconductors
Vinay Ambegaokar, Robert J. Gooding, Robert A. Smith
DOI 10.1103/PhysRevB.38.9217 · Physical Review B
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Abstract
A band of holes moving in an antiferromagnetic plane is used to model the weakly non-stoichiometric cuprate superconductors. We note that a singular density of states at the Brillouin-zone boundary, as is obtained from many different starting points, leads to a maximum in the transition temperature as a function of the deviation from stoichiometry. Numerical calculations of this effect, based on (i) the tight-binding bands that follow from Roth's approximate treatment of the Hubbard model for the CuO2 planes, and (ii) the attractive pairing between the oxygen holes that can result from considerations of the extended Hubbard model, are presented.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
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