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Paper detail

Enhanced Pairing Correlations near Oxygen Dopants in Cuprate Superconductors

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.

preprint2010arXivOpen access
Giniyat KhaliullinMichiyasu MoriTakami TohyamaSadamichi Maekawa
cond-mat.supr-concond-mat.str-el
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Giniyat KhaliullinMichiyasu MoriTakami TohyamaSadamichi Maekawa

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