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Highly doped states of fullerene C 60 solids have been investigated. A single phase of binary Ba 4 C 60 was first synthesized and confirmed to be a noncubic ambient pressure superconductor. By cointercalation of alkali metals and Ba, an isostructural series of alkali-Ba-C 60 , ternaries have been synthesized. This new class of compounds allows us to vary the band-filling...
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