Enhanced Pairing Correlations near Oxygen Dopants in Cuprate Superconductors

Giniyat Khaliullin; Michiyasu Mori; Takami Tohyama; Sadamichi Maekawa

doi:10.1103/PhysRevLett.105.257005

← Back to search

Enhanced Pairing Correlations near Oxygen Dopants in Cuprate Superconductors

Giniyat Khaliullin, Michiyasu Mori, Takami Tohyama, Sadamichi Maekawa

DOI 10.1103/PhysRevLett.105.257005 · Physical Review Letters

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

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 CuO2 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown