Important role of alkali atoms in A4C60
O. Gunnarsson, S. C. Erwin, E. Koch, R. M. Martin
Abstract
We show that hopping via the alkali atoms plays an important role for the t1u band of A4C60 (A=K, Rb), in strong contrast to A3C60. Thus the t1u band is broadened by more than 40 % by the presence of the alkali atoms. The difference between A4C60 and A3C60 is in particular due to the less symmetric location of the alkali atoms in A4C60.
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