Abstract
A novel carbon-cage network was reported, denoted as C(18), found to be a low energy structure by first principles particle swarm structure search. The compound exhibits high temperature electron-phonon ambient pressure superconductivity with T(c) = 79 K for elemental doping and can be raised to T(c) = 109 K by appropriate hole doping. Analyses of the phonon spectra, molecular dynamics simulations, and enthalpy differences relative to analogous structures synthesized experimentally all suggest that the hole-doped high-T(c) structure is a viable candidate for experimental synthesis.