Dopant-modulated pair interaction in cuprate superconductors

Details Dopant-modulated pair interaction in cuprate superconductors Dopant-modulated pair interaction in cuprate superconductors

2005-04-27

arxiv.org/abs/cond-mat/0504693v1

Phys. Rev. Lett. 95, 177003 (2005)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.95.177003

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 structure 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.

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