Abstract
Properties of the alkali-doped superconducting C 60 fullerenes are analyzed within the framework of an indirect exchange pairing mechanism of conduction electrons, via carbon-carbon double bonds of the C 60 molecules. Striking analogies with properties of electron-doped cuprates (e.g. Nd 2− x Ce x CuO 4− y ) are pointed out: here the conduction-electron coupling proceeds via the oxygen (O 2−) anions. On the basis of these analogies alone, the observed practically linear dependence of T c on the cubic lattice parameter in the doped fullerenes is quantitatively explained. In addition, calculated pressure coefficients of T c are in excellent agreement with experiment.
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