Investigation of the electronic structure in Eu1?xDyxTiO3 by means of soft X-ray absorption spectroscopy

The electronic structure of Eu 1− x Dy x TiO 3 is investigated by means of soft X-ray absorption spectroscopy (XAS) near the Ti L 2,3 -edges. The spectrum of EuTiO 3 shows a satellite structure in the high-energy side of four main peaks. The spectra analyzed by using a full-multiplet calculation and the observed features are almost reproduced by the cluster model. The satellite structure above four main peaks is due to the charge transfer (CT) from the O 2 p orbital to the Ti 3 d orbital. The intensity decreases with the composition of Dy. This tendency corresponds to the change of conductivity against x . This result means that the intensity of the charge transfer peak is strongly related to the conductivity in Eu 1− x Dy x TiO 3 . The charge transfer from the O 2 p orbital to the Ti 3 d orbital plays an important role in the conductivity in EuTiO 3 . According to the values of the parameters (charge transfer Δ, Coulomb interactions U dd , U dc ) obtained by the theoretical calculation, EuTiO 3 is an intermediate between the Mott-Hubbard-type and Charge-Transfer-type insulator.