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[en] We have investigated the electronic structure of Sr3Fe2-xCoxO7-δ using photoemission and soft x-ray absorption spectroscopy (XAS). From the analysis on the O 1s, Fe 2p, and Co 2p core level photoemission spectra and the line-shape analysis on the Fe and Co L2,3 edge XAS spectra, we concluded that the valence of Fe and Co are both ∼3.85+, the expected value. From the analysis of 2p-3d resonant photoemission spectra, we found that the electron density of states near the Fermi level has a dominant Fe 3d character and the Co 3d states are located below the Fe 3d states by ∼1 eV, in agreement with the smaller charge-transfer energy of Co4+ than that of Fe4+. (author)
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Hotta, Takashi (ed.) (Tokyo Metropolitan University, Hachioji, Tokyo (Japan)); Katsufuji, Takuro (ed.) (Waseda University, Tokyo (Japan)); [1157 p.]; ISBN 978-4-89027-142-9; 
; 2020; p. 011073.1-011073.6; SCES2019: International conference on strongly correlated electron systems; Okayama (Japan); 23-28 Sep 2019; Available from DOI: https://doi.org/10.7566/JPSCP.30.011073; 16 refs., 4 figs., 1 tab.
; 2020; p. 011073.1-011073.6; SCES2019: International conference on strongly correlated electron systems; Okayama (Japan); 23-28 Sep 2019; Available from DOI: https://doi.org/10.7566/JPSCP.30.011073; 16 refs., 4 figs., 1 tab.