Inhomogeneity-induced enhancement of the pairing interaction in cuprates
arXiv:cond-mat/0703566 · doi:10.1103/PhysRevLett.99.147006
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.
4 pages, 5 figures, revtex