Enhanced Pairing Correlations near Oxygen Dopants in Cuprate Superconductors

Details Enhanced Pairing Correlations near Oxygen Dopants in Cuprate Superconductors Enhanced Pairing Correlations near Oxygen Dopants in Cuprate Superconductors

2010-08-03

arxiv.org/abs/1008.0435v2

Phys. Rev. Lett. 105, 257005 (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures, minor revisions, to appear in PRL

Scientific paper

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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