  The pairing mechanism in A$_3$C$_{60}$ is investigated by studying the
properties of a three-orbital Hubbard model with antiferromagnetic Hund
coupling in the normal and superconducting phase. Local orbital fluctuations
are shown to be substantially enhanced in the superconducting state, with a
fluctuation energy scale that matches the low-energy peak in the spectral
weight of the order parameter. Our results demonstrate that local orbital
fluctuations provide the pairing glue in strongly correlated fulleride
superconductors and support the spin/orbital freezing theory of unconventional
superconductivity. They are also consistent with the experimentally observed
universal relation between the gap energy and local susceptibility in a broad
range of unconventional superconductors.
