The role of electron-vibron interaction and local pairing in conductivity and superconductivity of alkali-doped fullerides. Researchers investigate the competition between the electron-vibron interaction (interaction with the Jahn- Teller phonons) and the Coulomb repulsion in a system with local pairing of electrons on the triply degenerate lowest unoccupied molecular orbital (LUMO). The electron-vibron interaction radically changes conductivity and magnetic properties of alkali-doped fullerides AnC60, which should be antiferromagnetic Mott insulators: we have found that materials with n = 1, 2 and A = K, Rb are conductors but not superconductors; n = 3 and A = K, Rb are conductors (superconductors at low temperatures), but with A = Cr are Mott insulators; n = 2, 4 are nonmagnetic Mott insulators.