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Enhanced Pairing Correlations near Oxygen Dopants in Cuprate Superconductors

Authors
  • Khaliullin, Giniyat
  • Mori, Michiyasu
  • Tohyama, Takami
  • Maekawa, Sadamichi
Type
Published Article
Publication Date
Dec 09, 2010
Submission Date
Aug 02, 2010
Identifiers
DOI: 10.1103/PhysRevLett.105.257005
Source
arXiv
License
Yellow
External links

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 CuO_2 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.

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