hide
Free keywords:
-
Abstract:
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.