Dopant-Modulated Pair Interaction in Cuprate Superconductors

Tamara S. Nunner; Brian M. Andersen; Ashot Melikyan; P. J. Hirschfeld

doi:10.1103/PhysRevLett.95.177003

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Dopant-Modulated Pair Interaction in Cuprate Superconductors

Tamara S. Nunner, Brian M. Andersen, Ashot Melikyan, P. J. Hirschfeld

DOI 10.1103/PhysRevLett.95.177003 · Physical Review Letters

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Abstract

A comparison of recent experimental STM data with single-impurity and many-impurity Bogoliubov–de Gennes calculations strongly suggests that random out-of-plane dopant atoms in cuprates modulate the pair interaction locally. This type of disorder is crucial to understanding the nanoscale electronic inhomogeneity observed in BSCCO-2212, and can reproduce observed correlations between the positions of impurity atoms and various aspects of the local density of states such as the gap magnitude and the height of the coherence peaks. Our results imply that each dopant atom modulates the pair interaction on a length scale of order one lattice constant.

Source-reported materials — not catalogue approval

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