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

Angilella, Giuseppe G. N.; Pucci, Renato; Siringo, Fabio

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

Authors

Angilella, Giuseppe G. N.

Pucci, Renato

Siringo, Fabio

Description

Within a BCS-type mean-field approach to the extended Hubbard model, a nontrivial dependence of T_c on the hole content per unit CuO_2 is recovered, in good agreement with the celebrated non-monotonic universal behaviour 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 to single out an `intrinsic' contribution to d T_c / d P from that due to the carrier concentration, and provides a remarkable estimate of the dependence of the inter-site coupling strength on the lattice scale.
REVTeX 8 pages, including 5 embedded PostScript figures; other required macros included; to be published in Phys. Rev. B (vol. 54)