Within a BCS-type mean-field approach to the extended Hubbard model, a nontrivial dependence of T-c on the hole content per unit CuO2 is recovered, in good agreement with the celebrated nonmonotonic universal behavior at normal pressure. Evaluation of T-c at higher pressures is then made possible by the introduction of an explicit dependence of the tight-binding band and of the carrier concentration on pressure P. Comparison with the known experimental data for underdoped Bi2212 allows us to single out an ''intrinsic'' contribution to dT(c)/dP from that due to the carrier concentration, and provides a remarkable estimate of the dependence of the intersite coupling strength on the lattice scale.

Interplay among critical temperature, hole content, and pressure in the cuprate superconductors

ANGILELLA, Giuseppe Gioacchino Neil;SIRINGO, Fabio
1996-01-01

Abstract

Within a BCS-type mean-field approach to the extended Hubbard model, a nontrivial dependence of T-c on the hole content per unit CuO2 is recovered, in good agreement with the celebrated nonmonotonic universal behavior at normal pressure. Evaluation of T-c at higher pressures is then made possible by the introduction of an explicit dependence of the tight-binding band and of the carrier concentration on pressure P. Comparison with the known experimental data for underdoped Bi2212 allows us to single out an ''intrinsic'' contribution to dT(c)/dP from that due to the carrier concentration, and provides a remarkable estimate of the dependence of the intersite coupling strength on the lattice scale.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/13338
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