Enhanced Pairing Correlations near Oxygen Dopants in Cuprate Superconductors
Giniyat Khaliullin, Michiyasu Mori, Takami Tohyama, and Sadamichi, Maekawa
TL;DR
This paper proposes a local screening mechanism where oxygen dopants in cuprate superconductors enhance superexchange interactions, leading to increased pairing correlations and explaining observed spatial variations in superconducting properties.
Contribution
It introduces a novel local screening effect model that links oxygen dopants to increased superexchange coupling and pairing correlations in cuprates.
Findings
Oxygen dopants enhance superexchange coupling J.
Local pairing correlations are increased near dopants.
The model explains spatial variations in the density of states.
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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