Evidence of Eu2+ 4f electrons in the valence band spectra of EuTiO3 and EuZrO3 Journal Articles uri icon

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abstract

  • We report on optical band gap and valence electronic structure of two Eu2+-based perovskites, EuTiO3 and EuZrO3 as revealed by diffuse optical scattering, electron energy loss spectroscopy, and valence-band x-ray photoelectron spectroscopy. The data show good agreement with the first-principles studies in which the top of the valence band structure is formed by the narrow Eu 4f7 electron band. The O 2p band shows the features similar to those of the Ba(Sr)TiO3 perovskites except that it is shifted to higher binding energies. Appearance of the Eu2+ 4f7 band is a reason for narrowing of the optical band gap in the title compounds as compared to their Sr-based analogues.

authors

  • Kolodiazhnyi, T
  • Valant, M
  • Williams, JR
  • Bugnet, M
  • Botton, Gianluigi
  • Ohashi, N
  • Sakka, Y

publication date

  • October 15, 2012