Abstract
Comparative high-energy resolution (Δ E ∼ 30 meV) photoemission spectroscopy has been performed for Cs x C 60 and K x C 60 to study the difference and similarity in the electronic structure near the Fermi level ( E F) between the superconducting and the non-superconducting alkali-doped C 60. It was found that Cs x C 60 (0≤ x≤6) is a semiconductor or an insulator in the whole composition range except for 0< x≤1 where the Cs doped C 60 appears to be metallic with a finite density of states at E F. This shows a sharp contrast with the case of K x C 60 which exhibits a relatively large density of states at E F in the composition of 0< x<4 with the largest intensity around x = 3.
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