TITLE

Direct imaging of doped fluorine in LaFeAsO1-xFx superconductor by atomic scale spectroscopy

AUTHOR(S)
Tohei, Tetsuya; Mizoguchi, Teruyasu; Hiramatsu, Hidenori; Kamihara, Yoichi; Hosono, Hideo; Ikuhara, Yuichi
PUB. DATE
November 2009
SOURCE
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p193107
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report direct observation of fluorine ion dopants in the recently discovered LaFeAsO1-xFx superconductor, where the doping is critical for the superconductivity. Employing spectroscopic imaging based on scanning transmission electron microscopy, the spatial distribution of the doped fluorine ions, which are invisible in Z-contrast imaging, is clearly visualized with atomic-scale resolution. The observation directly proves that fluorine substitutes into the oxygen site in the superconducting LaFeAsO1-xFx compound. Our results demonstrate the potential of the present method for revealing dopants undetectable by conventional microscopy imaging.
ACCESSION #
45249202

 

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