| Band Gap, Excitons, and Coulomb Interaction in Solid C60 (1992) | |||||||||||||
Abstract | |||||||||||||
| The band gap of solid C60 is found to be 2.3 ± 0.1 eV. The on-site molecular C60 Coulomb interaction (U) as determined from the KVV C60 Auger spectrum is found to be 1.6 ± 0.2 eV. This value of U is shown to lead to Frenkel-type molecular excitons in the 1.5-2 eV range. These results lead us to suggest that doped C60 should be considered as a highly correlated system with U/W comparable to that in high-Tc cuprates and that stoichiometric K3C60 is a Mott-Hubbard insulator with a gap of about 0.7 eV. | |||||||||||||
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