Effects of an electronic topological transition for anisotropic low-dimensional superconductors

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dc.creatorAngilella, G. G. N.
dc.creatorPiegari, E.
dc.creatorVarlamov, A. A.
dc.date2002-04-27
dc.date.accessioned2026-07-07T02:45:14Z
dc.date.available2026-07-07T02:45:14Z
dc.descriptionWe study the superconducting properties of a two-dimensional superconductor in the proximity to an electronic topological transition (ETT). In contrast to the 3D case, we find that the superconducting gap at T=0, the critical temperature Tc, and the impurity scattering rate are characterized by a nonmonotonic behavior, with maxima occurring close to the ETT. We derive analytical expressions for the value of such maxima both in the s-wave and in the d-wave case. Such expressions are in good qualitative agreement with the phenomenological trend recently observed for Tc^max as a function of the hopping ratio t'/t across several cuprate compounds. We further analyze the effect of an ETT on the Ginzburg-Landau stiffness eta. Instead of vanishing at the ETT, as could be expected, thus giving rise to an increase of the fluctuation effects, in the case of momentum-independent electron-electron interaction, we find eta different from 0, as a result of an integration over the whole Fermi surface.
dc.descriptionto be published in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0204585
dc.identifierhttp://arxiv.org/abs/cond-mat/0204585
dc.identifierPhys. Rev. B 66, 014501 (2002)
dc.identifierdoi:10.1103/PhysRevB.66.014501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/19227
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleEffects of an electronic topological transition for anisotropic low-dimensional superconductors
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