title: Enhanced pairing correlations near oxygen dopants in cuprate superconductors.
abstract: Recent experiments on Bi-based cuprate superconductors have revealed an unexpected enhancement of the pairing correlations near the interstitial oxygen dopant ions. Here we propose a possible mechanism--based on local screening effects--by which the oxygen dopants do modify the electronic parameters within the CuO2 planes and strongly increase the superexchange coupling J. This enhances the spin pairing effects locally and may explain the observed spatial variations of the density of states and the pairing gap.
authors.affiliation: Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
authors.forename: Giniyat
authors.initials: G
authors.lastname: Khaliullin
authors.forename: Michiyasu
authors.initials: M
authors.lastname: Mori
authors.forename: Takami
authors.initials: T
authors.lastname: Tohyama
authors.forename: Sadamichi
authors.initials: S
authors.lastname: Maekawa