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 2 p–3 d resonant photoemission measurements revealed that the Fe 3 d 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 3 d-derived conduction band hybridized with O 2 p states; these can be assigned to Fe 3 d xy , 3 d xz + 3 d yz , and 3 d 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.
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