title: Inhomogeneity-induced enhancement of the pairing interaction in cuprate superconductors.
abstract: Scanning tunneling spectroscopy has recently discovered a positive correlation between the magnitude of the superconducting gap and positions of dopant oxygen atoms in Bi-based cuprates. We propose a microscopic mechanism that could be responsible for this effect. In particular, we demonstrate that the dopant-induced spatial variation of the atomic levels always enhances the superexchange interaction.
authors.affiliation: Institute of Physics, University of Silesia, 40-007, Katowice, Poland.
authors.forename: Maciej M
authors.initials: MM
authors.lastname: Maśka
authors.forename: Zaneta
authors.initials: Z
authors.lastname: Sledź
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Czajka
authors.forename: Marcin
authors.initials: M
authors.lastname: Mierzejewski