ELECTRONIC-STRUCTURE CLOSE TO E(F) IN LOW-LEVEL ALKALI-DOPED C-60

High-resolution photoemission study of the valence-band electronic structure of A(x)C(60) (A = K or Cs; x less than or similar to 3) close to EF reveals a phase separation into components exhibiting a dilute solid solution of alkali in fullerite (alpha-C-60) and A(3)C(60). The alpha-C-60 phase is found to be remarkably stable against oxidation. Our analysis shows a strongly correlated electronic system in this phase. The similarity of the present data to previously published results for Li-, Na- and Rb-doped C-60 demonstrates the common character of the observed phenomena for this series of alkali-doped fullerites.