Gap anisotropy and universal pairing scale in a spin-fluctuation model of cuprate superconductors

Title:	Gap anisotropy and universal pairing scale in a spin-fluctuation model of cuprate superconductors
Author:	Abanov, Artem; Chubukov, A. V.; Norman, M. R.
Abstract:	We consider the evolution of d(x)(2)-y(2) pairing, mediated by nearly critical spin fluctuations, with the coupling strength. We show that the onset temperature for pairing, T(), smoothly evolves between weak and strong couplings passing through a broad maximum at intermediate coupling. At strong coupling, T() is of order of the magnetic exchange energy J. We argue that for all couplings, pairing is confined to the vicinity of the Fermi surface. We also find that thermal spin fluctuations only modestly reduce T(*), even at criticality, but they substantially smooth the gap anisotropy. The latter evolves with coupling being the largest at weak coupling.
Description:	Journals published by the American Physical Society can be found at http://journals.aps.org/
Publisher:	American Physical Society
Subject:	d-wave superconductivity exchange interactions (electron) Fermi surface fluctuations in superconductors high-temperature superconductors spin fluctuations 2-DIMENSIONAL HUBBARD-MODEL PHASE FLUCTUATIONS FERMI-LIQUID T-C Physics
Department:	Physics and Astronomy
URI:	http://dx.doi.org/10.1103/PhysRevB.78.220507
Date:	2008