Combining photoemission and optical spectroscopies for reliable valence determination in YbS and Yb metal

M. Matsunami, A. Chainani, M. Taguchi, R. Eguchi, Y. Ishida, Y. Takata, H. Okamura, T. Nanba, M. Yabashi, K. Tamasaku, Y. Nishino, T. Ishikawa, Y. Senba, H. Ohashi, N. Tsujii, A. Ochiai, S. Shin

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Abstract

Hard x-ray photoemission and optical spectroscopies have been performed on YbS and Yb metal to determine the precise f -electron occupation. A comparison of the photoemission spectra with the energy-loss functions in bulk and surface, obtained from optical reflectivity, enables us to distinguish between the energy-loss satellite of Yb2+ peak and the Yb3+ multiplet. The results clearly indicate a purely divalent Yb state except for the surface of YbS which is altered by oxidation. We demonstrate that the present method is highly reliable in identifying the electronic structure and the mean valence in f -electron systems.

Original languageEnglish
Article number195118
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume78
Issue number19
DOIs
Publication statusPublished - 2008 Nov 19

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Matsunami, M., Chainani, A., Taguchi, M., Eguchi, R., Ishida, Y., Takata, Y., Okamura, H., Nanba, T., Yabashi, M., Tamasaku, K., Nishino, Y., Ishikawa, T., Senba, Y., Ohashi, H., Tsujii, N., Ochiai, A., & Shin, S. (2008). Combining photoemission and optical spectroscopies for reliable valence determination in YbS and Yb metal. Physical Review B - Condensed Matter and Materials Physics, 78(19), [195118]. https://doi.org/10.1103/PhysRevB.78.195118