Superconductivity in Alkali-Doped C60

There ark three kinds of effective attractive interaction between C₆₀^2- and "nearly free" electron in A₃C₆₀: 1) the strong short-range attraction between the low energy unoccupied orbital of C₆₀^2- ions and the "nearly free" electrons; 2) the potential barrier due to large angular momentum of t_1u orbital; 3) the A⁺ crystal field forced "nearly free" electrons in C₆₀^2- neighborhood. All effective attraction coupling with the A⁺ optical modes and the vibration modes of C₆₀ mass center produces a strong electron-phonon interaction. It plays a principal role for A₃C₆₀ superconductivity. Based upon this mechanism critical temperature and other properties of superconductivity state can be explained by means of the BCS theory.