Direct evidence of intercalation in a topological insulator turned superconductor

preprint2012arXivOpen access

Abstract

A topological insulator Bi2Se3 which shows superconducting property due to Cu doping has been studied using high resolution transmission electron microscopy which provides for the first time, the direct evidence of intercalation sites. A careful study exhibits the presence of two intercalation sites in this material when projected along the [-1-1 2 0] direction. Stoichiometry of the intercalated unit cell was also calculated from the projected potential.

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