| Correlation Effects in Solid C60 (1992) | |||||||||||||
Abstract | |||||||||||||
| The bandgap 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 ± .2 eV. This value of U is shown to be consistent with 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. The Auger spectroscpoy results are consistent with a rather long range Coulomb interaction on a single bucky ball indicating that a Hubbard model is not suitable to describe the electronic structure of a C60 molecule. | |||||||||||||
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