Sharp k-space features in the order parameter within the interlayer pair-tunneling mechanism of high-T_c superconductivity

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dc.creatorAngilella, G. G. N.
dc.creatorPucci, R.
dc.creatorSiringo, F.
dc.creatorSudbo, A.
dc.date1998-10-20
dc.date.accessioned2026-07-07T03:11:46Z
dc.date.available2026-07-07T03:11:46Z
dc.descriptionWe study the k-dependence of the gap function of a bilayer superconductor, using standard mean-field techniques applied to a 2D extended Hubbard model, in the presence of coherent interlayer pair-tunneling and quenched coherent single-particle tunneling. The intralayer pairing potential thus defined is expandable in a finite number of basis functions for the irreducible representations of the point-group of the perfectly square lattice, C_{4v}. This gives rise to a competition between s- and d-wave symmetry, as the chemical potential is increased from the bottom to the top of a realistic band for most cuprates. It allows for mixed-symmetry paired state at temperatures below T_c, but never at T_c on a square lattice. Inclusion of the interlayer pair-tunneling into the effective pairing potential leads to highly non-trivial k-space structures, such as pronounced maxima along the Fermi line not seen in the absence of interlayer pair-tunneling. We show how such a gap structure evolves with temperature and with band filling, and how it affects various observables. In particular, a nonuniversal value of the normalized jump in the specific heat at T_c will be evidenced, at variance with the conventional universal BCS result.
dc.description17 REVTeX pages, including 6 PostScript figures; accepted for publication in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/9810250
dc.identifierhttp://arxiv.org/abs/cond-mat/9810250
dc.identifierPhys. Rev. B 59 (1999) 1339
dc.identifierdoi:10.1103/PhysRevB.59.1339
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28704
dc.subjectSuperconductivity
dc.titleSharp k-space features in the order parameter within the interlayer pair-tunneling mechanism of high-T_c superconductivity
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