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

Tetsuya Tohei; Teruyasu Mizoguchi; Hidenori Hiramatsu; Yoichi Kamihara; Hideo Hosono; Yuichi Ikuhara

doi:10.1063/1.3263148

Direct imaging of doped fluorine in LaFeAsO_1-xF_x superconductor by atomic scale spectroscopy

Tetsuya Tohei, Teruyasu Mizoguchi, Hidenori Hiramatsu, Yoichi Kamihara, Hideo Hosono, Yuichi Ikuhara

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

We report direct observation of fluorine ion dopants in the recently discovered LaFeAsO_1-xF_x 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 LaFeAsO _1-xF_x compound. Our results demonstrate the potential of the present method for revealing dopants undetectable by conventional microscopy imaging.

Original language	English
Article number	193107
Journal	Applied Physics Letters
Volume	95
Issue number	19
DOIs	https://doi.org/10.1063/1.3263148
Publication status	Published - 2009
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.3263148

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title = "Direct imaging of doped fluorine in LaFeAsO1-xFx superconductor by atomic scale spectroscopy",

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 LaFeAsO 1-xFx compound. Our results demonstrate the potential of the present method for revealing dopants undetectable by conventional microscopy imaging.",

author = "Tetsuya Tohei and Teruyasu Mizoguchi and Hidenori Hiramatsu and Yoichi Kamihara and Hideo Hosono and Yuichi Ikuhara",

note = "Funding Information: The authors acknowledge T. Yamamoto, N. Shibata, and S. D. Findlay for fruitful discussions, and H. Tsunakawa, T. Ito, S. Ohtsuka, T. Saito, and N. Saito for assistance in the experiments. This work was supported by a Grant-in-Aid for Scientific Research on Priority Areas “Nano Materials Science for Atomic Scale Modification 474” from the MEXT of Japan. A part of this work was conducted in the Center for Nano Lithography and Analysis, The University of Tokyo, supported by the MEXT, Japan.",

year = "2009",

doi = "10.1063/1.3263148",

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volume = "95",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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AU - Tohei, Tetsuya

AU - Mizoguchi, Teruyasu

AU - Hiramatsu, Hidenori

AU - Kamihara, Yoichi

AU - Hosono, Hideo

AU - Ikuhara, Yuichi

N1 - Funding Information: The authors acknowledge T. Yamamoto, N. Shibata, and S. D. Findlay for fruitful discussions, and H. Tsunakawa, T. Ito, S. Ohtsuka, T. Saito, and N. Saito for assistance in the experiments. This work was supported by a Grant-in-Aid for Scientific Research on Priority Areas “Nano Materials Science for Atomic Scale Modification 474” from the MEXT of Japan. A part of this work was conducted in the Center for Nano Lithography and Analysis, The University of Tokyo, supported by the MEXT, Japan.

PY - 2009

Y1 - 2009

N2 - 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 LaFeAsO 1-xFx compound. Our results demonstrate the potential of the present method for revealing dopants undetectable by conventional microscopy imaging.

AB - 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 LaFeAsO 1-xFx compound. Our results demonstrate the potential of the present method for revealing dopants undetectable by conventional microscopy imaging.

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Direct imaging of doped fluorine in LaFeAsO_1-xF_x superconductor by atomic scale spectroscopy

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