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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