Enhanced Pairing Correlations near Oxygen Dopants in Cuprate Superconductors

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.

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

References in corpus (7)

• Visualizing pair formation on the atomic scale in the high-Tc superconductor Bi2Sr2CaCu2O8+d
• Electronic Origin of the Inhomogeneous Pairing Interaction in the High-Tc Superconductor Bi2Sr2CaCu2O8+d
• Inhomogeneity-induced enhancement of the pairing interaction in cuprates
• Effect of dopant atoms on local superexchange in cuprate superconductors: a perturbative treatment
• Microscopic Inhomogeneity and Superconducting Properties of a Two-dimensional Hubbard Model for High-$T_c$ Cuprate
• Unusual photoemission resonances of oxygen-dopant induced states in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$
• Real-space fluctuations of effective exchange integrals in high-Tc cuprates

Cited by in corpus (5)

• Two routes to magnetic order by disorder in underdoped cuprates
• Local modulations of the spin-fluctuation mediated pairing interaction by impurities in d-wave superconductors
• Doping Dependence of Gap Inhomogeneities at Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Surfaces
• First principle prediction of structural distortions in the cuprates and their impact on the electronic structure
• Modulations of the local pairing interaction near magnetic impurities in d-wave superconductors