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

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

1996-08-27

arxiv.org/abs/cond-mat/9608132v1

Phys. Rev. B 54, 15471 (1996)

Physics

Condensed Matter

REVTeX 8 pages, including 5 embedded PostScript figures; other required macros included; to be published in Phys. Rev. B (vol.

Scientific paper

10.1103/PhysRevB.54.15471

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.

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