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Specific-heat jump at Tc and normal-state magnetic susceptibility of A3C60.

We have measured the normal-state susceptibility χ for both K 3 C 60 and Rb 3 C 60 and the specific-heat jump ΔC at the superconducting T c for K 3 C 60 . Within a phonon-mediated pairing model, the combined effects of χ and ΔC are shown to give strong support to pairing via high-energy modes (>1000 K) associated with intramolecular vibrations