Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-09-26
Phys. Rev. B, 78, 195118 (2008).
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1103/PhysRevB.78.195118
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 Yb$^{2+}$ peak and Yb$^{3+}$ multiplet. The results clearly indicate a purely divalent Yb state except for the surface of YbS. We demonstrate that the present method is highly reliable in identifying the electronic structure and the mean valence in $f$-electron systems.
Chainani Ashish
Eguchi R.
Ishida Yasuchika
Ishikawa Tadashi
Matsunami Masaharu
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