J. Phys. I France 6 (1996) 2175-2180
From Weakly to Strongly Correlated Electrons in the Alkali Fulleride FamilyW. Victoroff and M. Héritier
Laboratoire de Physique des Solides URA 2 CNRS, Centre Scientifique d'Orsay, Université de Paris-Sud, 91405 Orsay Cedex, France
(Received 26 June 1996, received in final form 12 July 1996, accepted 13 August 1996)
We discuss the effect of strong electron-vibron interaction and static or dynamic Jahn-Teller distortion on the electronic properties of the A nC 60 family, where A is alkali metal and . 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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