TY - JOUR
T1 - Investigation of electronic states of infinite-layer SrFeO 2 epitaxial thin films by X-ray photoemission and absorption spectroscopies
AU - Chikamatsu, Akira
AU - Matsuyama, Toshiya
AU - Hirose, Yasushi
AU - Kumigashira, Hiroshi
AU - Oshima, Masaharu
AU - Hasegawa, Tetsuya
N1 - Funding Information:
This work was performed under Project No. 2009G085 and 2008S2-003 at the Institute of Materials Structure Science in KEK, and supported by Core Research for Evolutional Science and Technology, the Japan Science and Technology Agency (CREST-JST), and the Global Centers of Excellence (GCOE) Program for Chemistry Innovation.
PY - 2012/1
Y1 - 2012/1
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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U2 - 10.1016/j.elspec.2011.09.002
DO - 10.1016/j.elspec.2011.09.002
M3 - Article
AN - SCOPUS:84855799315
VL - 184
SP - 547
EP - 550
JO - Journal of Electron Spectroscopy and Related Phenomena
JF - Journal of Electron Spectroscopy and Related Phenomena
SN - 0368-2048
IS - 11-12
ER -