Abstract
High-energy resolved low-temperature ultraviolet photoemission spectroscopy has been performed on KxC60 (x=0 − 6) to study the detailed electronic structure near the Fermi level (E F). The experimental result shows that a very narrow peak and a broad distribution of density of states coexist near E F in K3C60. While the narrow peak at E F is correlated to a part of the occupied LUMO (lowest unoccupied molecular orbital) band of C60 as predicted from the band structure calculation, the observed broad distribution of density of states near E F has no counterpart in the calculation. It was also found that K 4C 60 is a semiconductor with an energy gap of more than 0.2 eV. This shows a sharp contrast with the prediction from the band calculation that K4C60 should be a metal with four electrons in the three-fold degenerate LUMO band. Some possible origins to give these discrepancies have been discussed.
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