Photoemission study of carriers and Ce 4f spectral weight in CeTe2

Abstract

The electronic structure of CeTe2 has been investigated by performing high-resolution photoemission spectroscopy (PES) measurements on high-quality stoichiometric single crystals of CeTe2. The Ce 3d XAS measurement indicates that the Ce ions are trivalent. The Ce 4f PES spectrum reveals two-peak structures with the Ce 4f bulk hybridization peak located around 0.8 eV below E-F. The high-resolution, high-energy, bulk-sensitive PES study of CeTe2 provides evidence for a metallic density of states near E-F. The carriers near EF consist mainly of Ce 5d and Te(1) 5p states, while the contribution from the Cc 4f and Te(2) 5p states is negligible. This finding agrees with the CDW instability in the Te(1) sheets.