Investigation of electronic states of infinite-layer SrFeO 2 epitaxial thin films by X-ray photoemission and absorption spectroscopies

Akira Chikamatsu; Toshiya Matsuyama; Yasushi Hirose; Hiroshi Kumigashira; Masaharu Oshima; Tetsuya Hasegawa

doi:10.1016/j.elspec.2011.09.002

Investigation of electronic states of infinite-layer SrFeO ₂ epitaxial thin films by X-ray photoemission and absorption spectroscopies

Akira Chikamatsu, Toshiya Matsuyama, Yasushi Hirose, Hiroshi Kumigashira, Masaharu Oshima, Tetsuya Hasegawa

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

9 Citations (Scopus)

Abstract

We investigated the electronic states of a single-crystal SrFeO ₂ epitaxial thin film in the valence-band and conduction-band regions using synchrotron-radiation X-ray photoemission and absorption spectroscopies. Fe 2p-3d resonant photoemission measurements revealed that the Fe 3d states have higher densities of states at binding energies of 3-5 eV and 5-8.5 eV in the valence-band region. The O K-edge X-ray absorption spectrum exhibited three peaks in the Fe 3d-derived conduction band hybridized with O 2p states; these can be assigned to Fe 3d _xy, 3d _xz + 3d _yz, and 3d _x ² _-y ². In addition, the indirect bandgap value of the SrFeO ₂ film was determined to be 1.3 eV by transmission and absorption spectroscopies.

Original language	English
Pages (from-to)	547-550
Number of pages	4
Journal	Journal of Electron Spectroscopy and Related Phenomena
Volume	184
Issue number	11-12
DOIs	https://doi.org/10.1016/j.elspec.2011.09.002
Publication status	Published - 2012 Jan 1
Externally published	Yes

Keywords

Electronic states
Epitaxial thin films
Optical gap
Photoemission spectroscopy
SrFeO
X-ray absorption spectroscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Radiation
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Spectroscopy
Physical and Theoretical Chemistry

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Investigation of electronic states of infinite-layer SrFeO ₂ epitaxial thin films by X-ray photoemission and absorption spectroscopies. / Chikamatsu, Akira; Matsuyama, Toshiya; Hirose, Yasushi; Kumigashira, Hiroshi; Oshima, Masaharu; Hasegawa, Tetsuya.

In: Journal of Electron Spectroscopy and Related Phenomena, Vol. 184, No. 11-12, 01.01.2012, p. 547-550.

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

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abstract = "We investigated the electronic states of a single-crystal SrFeO 2 epitaxial thin film in the valence-band and conduction-band regions using synchrotron-radiation X-ray photoemission and absorption spectroscopies. Fe 2p-3d resonant photoemission measurements revealed that the Fe 3d states have higher densities of states at binding energies of 3-5 eV and 5-8.5 eV in the valence-band region. The O K-edge X-ray absorption spectrum exhibited three peaks in the Fe 3d-derived conduction band hybridized with O 2p states; these can be assigned to Fe 3d xy, 3d xz + 3d yz, and 3d x 2 -y 2. In addition, the indirect bandgap value of the SrFeO 2 film was determined to be 1.3 eV by transmission and absorption spectroscopies.",

keywords = "Electronic states, Epitaxial thin films, Optical gap, Photoemission spectroscopy, SrFeO, X-ray absorption spectroscopy",

author = "Akira Chikamatsu and Toshiya Matsuyama and Yasushi Hirose and Hiroshi Kumigashira and Masaharu Oshima and Tetsuya Hasegawa",

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AU - Chikamatsu, Akira

AU - Matsuyama, Toshiya

AU - Hirose, Yasushi

AU - Kumigashira, Hiroshi

AU - Oshima, Masaharu

AU - Hasegawa, Tetsuya

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N2 - We investigated the electronic states of a single-crystal SrFeO 2 epitaxial thin film in the valence-band and conduction-band regions using synchrotron-radiation X-ray photoemission and absorption spectroscopies. Fe 2p-3d resonant photoemission measurements revealed that the Fe 3d states have higher densities of states at binding energies of 3-5 eV and 5-8.5 eV in the valence-band region. The O K-edge X-ray absorption spectrum exhibited three peaks in the Fe 3d-derived conduction band hybridized with O 2p states; these can be assigned to Fe 3d xy, 3d xz + 3d yz, and 3d x 2 -y 2. In addition, the indirect bandgap value of the SrFeO 2 film was determined to be 1.3 eV by transmission and absorption spectroscopies.

AB - We investigated the electronic states of a single-crystal SrFeO 2 epitaxial thin film in the valence-band and conduction-band regions using synchrotron-radiation X-ray photoemission and absorption spectroscopies. Fe 2p-3d resonant photoemission measurements revealed that the Fe 3d states have higher densities of states at binding energies of 3-5 eV and 5-8.5 eV in the valence-band region. The O K-edge X-ray absorption spectrum exhibited three peaks in the Fe 3d-derived conduction band hybridized with O 2p states; these can be assigned to Fe 3d xy, 3d xz + 3d yz, and 3d x 2 -y 2. In addition, the indirect bandgap value of the SrFeO 2 film was determined to be 1.3 eV by transmission and absorption spectroscopies.

KW - Electronic states

KW - Epitaxial thin films

KW - Optical gap

KW - Photoemission spectroscopy

KW - SrFeO

KW - X-ray absorption spectroscopy

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