Soft x-ray angle-resolved and resonance photoemission study of CeCu2Ge2 and LaCu2Ge2

Abstract

We have performed bulk-sensitive soft x-ray angle-resolved photoemission spectroscopy for CeCu2Ge2 isostructural to a heavy fermion superconductor CeCu2Si2, indicating the localized 4f character in ambient pressure. Resonance enhancement is seen at the La 3d5/2-edge for LaCu2Ge2 in both angle-resolved and integrated photoemission although the magnitude of enhancement is less than that in the Ce 3d5/2-edge resonance photoemission for CeCu2Ge2, which indicates that the rare-earth 5d contributions can also be enhanced in addition to the 4f contributions at the resonance conditions.