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Phys. Rev. Lett. 68, 3924 - 3927 (1992)

Band gap, excitons, and Coulomb interaction in solid C60

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R. W. Lof, M. A. van Veenendaal, B. Koopmans, H. T. Jonkman, and G. A. Sawatzky
Laboratory of Solid State and Applied Physics, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

Received 11 March 1992

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.


©1992 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.68.3924
DOI: 10.1103/PhysRevLett.68.3924
PACS: 79.60.Eq

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