Effect of nonuniform holecontent distribution within the interlayer pairtunneling mechani.pdfVIP

Effect of nonuniform hole-content distribution 4 within the interlayer pair-tunneling 0 0 2 mechanism of layered HTSC p e S 7 Giuseppe G. N. Angilella and Renato Pucci 1 ] Dipartimento di Fisica dell’Universit`a di Catania and n o Istituto Nazionale per la Fisica della Materia, Unit`a Locale di Catania, c 57, Corso Italia, I-95129 Catania, Italy - r p u s t. Abstract a m The interlayer pair-tunneling (ILPT) mechanism for high-Tc superconductivity is - d able to predict the dependence of the (optimal) critical temperature Tc on the num- n ber of layers n within an homologous series of layered cuprate oxides. We generalize o c the mean-field procedure employed to evaluate Tc within an extended in-plane Hub- [ bard model in presence of ILPT, developed for a bilayer complex (n = 2), to the case of n = 3, 4 inequivalent superconducting layers. As a function of doping, we 1 show how a nonuniform hole-content distribution among different layers affects T . v c 1 In particular, depending on doping, the onset of superconductivity may be ruled by 6 4 inner or outer layers. The latter result may be related to recent experimental data 9 of Tc as a function of pressure in Tl- and Bi-based layered superconductors. 0 4 0 Key words: High-Tc superconductivity; doping; layered cuprates; pressure effects. / t a m - d n 1 Introduction o c : v Among the features that have been recognized to