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

Giuseppe G. N. Angilella·Renato Pucci·Fabio Siringo
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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 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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Giuseppe G. N. Angilella, Renato Pucci, Fabio Siringo. 1996-08-27. Interplay among critical temperature, hole content, and pressure in the cuprate superconductors. https://doi.org/10.1103/physrevb.54.15471

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