Free Univ Berlin Inst Exptl Phys Arnimallee 14 D-14195 Berlin Germany
Kernforschungszentrum Karlsruhe Inst Nukl Festkorperphys D-76021 Karlsruhe Germany
Max Planck Inst Festkorperforsch D-70569 Stuttgart Germany

The electronic structure of K-doped C60 was investigated by photoemission (PE) and X-ray absorption near-edge structure (XANES) studies at the C-1s and K-2p thresholds. In addition, information on the local K-derived partial density of states in superconducting K3C60 was obtained by resonant PE at the K-2p1/2 threshold. The experimental observations support a complete charge transfer from K to C60 and we clearly observe a finite density of states at E(F). From resonant PE, occupied states with K-p, d character could be identified in the binding-energy region from 1.5 to 8 eV below, but not directly at the Fermi level. This partial-density-of-states structure agrees well with the results of our band-structure calculations based on the local-density approximation.
 

Zeitschrift fur Physik D, 92 347-351, 1993.