Photon Energy dependent Hard X-Ray Photoemission Spectroscopy of YbCu<sub>2</sub>Si<sub>2</sub>
- Kitayama, S.
- Fujiwara, H.
- Gloskovsky, A.
- Gorgoi, M.
- Schaefers, F.
- Felser, C.
- Funabashi, G.
- Yamaguchi, J.
- Kimura, M.
- Kuwahara, G.
- Imada, S.
- Higashiya, A.
- Tamasaku, K.
- Yabashi, M.
- Ishikawa, T.
- Onuki, Y.
- Ebihara, T.
- Suga, S.
- Sekiyama, A.
Publication date
December 2012
DOIAbstract
We have performed photon energy (h nu) dependent hard X-rayphotoemission spectroscopy (HAXPES) for YbCu2Si2, which is a heavy Fermion compound with intermediate Yb valence. We identified that the bulk components in the Si 1s and Yb 3d spectra develop with increasing h nu from 2.5 keV to 6 keV. Moreover, the temperature dependence of the Yb 3d spectra measured at h nu = 8 keV has shown a valence fluctuation behavior. These results suggest that high h nu HAXPES is essential to determine the mean valence of the Yb compounds
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