From Weakly to Strongly Correlated Electrons in the Alkali Fulleride Family

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Abstract
We discuss the effect of strong electron-vibron interaction and static or dynamic Jahn-Teller distortion on the electronic properties of the AnC60 family, where A is alkali metal and 0≤n≤6. Repulsive electron-electron correlations are expected for even n, but attractive ones for odd n. Such a model seems able to make compatible weak electron correlations for n=3 fairly strong correlations for n=1 and an insulating behavior for n=2 or 4

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