Abstract
The electronic structure of A4C60 compounds (A=Na, K, Cs) has been studied using electron energy-loss spectroscopy. Both the low energy loss functions and Cls core excitation measurements reveal a strong splitting of the electronic states near the Fermi level in comparison with K3C60 or K6C60. This splitting indicates a lowering of the high degeneracy of the C60 molecular orbitals due to a broken symmetry ground state and/or the opening of a correlation gap in these systems.
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Knupfer, M., Fink, J. & Armbruster, J. Splitting of the electronic states near EF in A4C60 compounds (A = alkali metal). Z. Phys. B - Condensed Matter 101, 57–60 (1996). https://doi.org/10.1007/s002570050180
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DOI: https://doi.org/10.1007/s002570050180