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Report No.
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Investigation of structural and electronic properties in Ru perovskite oxides by XAFS measurements

Mizumaki, Masaichiro*; Yoshii, Kenji ; Hinatsu, Yukio*; Doi, Yoshihiro*; Uruga, Tomoya*

The electronic and structural properties of Ru oxides were investigated by utilizing X-ray absorption spectroscopy (XAS). We estimate the valence of Ru in perovskite ruthenium oxides by XAS measurements. XAS measurements were carried out at room temperature around Ru K-edge. The valence of Ru in $$A$$$$_{2}$$ ($$A$$ = Ba, Sr)LnRuO$$_{6}$$ and $$A$$ ($$A$$ = Ca, Ba, Sr)RuO$$_{3}$$ was 4+. The valence of Ru in Ln$$_{3}$$RuO$$_{7}$$ was 5+. The valence of Ru in PbRuO$$_{3}$$ showed an intermediate value between 4+ and 5+. Theoretical calculation reproduced the experimental spectra. We analyzed XAS spectra and obtained information of local structure. The bond length between Ru and O was consistent with the results of neutron diffraction.

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