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Report No.

Electronic structure observation of BaTiO$$_{3}$$ using resonant X-ray emission at Ba L$$_{3}$$ and Ti K edges

Yoshii, Kenji  ; Yoneda, Yasuhiro   ; Jarrige, I.*; Fukuda, Tatsuo  ; Nishihata, Yasuo; Suzuki, Chikashi ; Ito, Yoshiaki*; Yoshikado, Shinzo*; Fukushima, Sei*

We have studied the electronic properties of the ferroelectric barium titanate BaTiO$$_{3}$$ using resonant X-ray emission spectroscopy (RXES) and X-ray absorption spectroscopy in the partial fluorescence mode (PFY-XAS) at the Ba L$$_{3}$$ and Ti K absorption edges. Contrary to a previous study, we found no fine structure in the pre-edge area of the PFY-XAS spectrum at the Ba L3 edge, and no temperature-induced spectral change was observed across the Curie temperature (130$$^{circ}$$C). This result is not supportive of the possible presence of the displacement around Ba$$^{2+}$$ at the Curie temperature. RXES spectra were measured at the Ti K edge. The photon energy of the emission peak is found to be nearly constant throughout the absorption edge for all three compounds. We deduce the Ti 3d states to have a delocalized character, in contrast with the Ba 5d states, a property which is consistent with the proposed scenario of the formation of electric dipoles in BaTiO$$_{3}$$.



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