Synchrotron radiation photoemission studies show that the mixing of Mg, Sr, and Ba with C₆₀ yields metallic (Sr and Ba) and nonmetallic (Mg) fullerides. In all cases, fulleride formation leads to the occupation of hybrid bands near the Fermi level that are derived from C₆₀ states and the s states of the alkaline-earth atoms. The nonmetallic character of Mgₓ{C}₆₀$ probably reflects electron correlation effects, and metallic ${Sr}ₓC₆₀ and Baₓ{C}₆₀$ fullerides are candidates for superconductivity.
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Chen et al. (1992) studied this question.
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