Towards room-temperature superconductivity in low-dimensional carbon nanostructures

We propose to raise the critical temperature T_c for superconductivity in doped C₆₀ molecular crystals by increasing the electronic density of states at the Fermi level N(E_F) and thus the electron-phonon coupling constant in low-dimensional C₆₀ nanoarrays. We consider both electron and hole doping and present numerical results for N(E_F), which increases with decreasing bandwidth of the partly filled h_u and t_1u derived frontier bands with decreasing coordination number of C₆₀. Whereas a significant increase of N(E_F) occurs in 2D arrays of doped C₆₀ intercalated in-between graphene layers, we propose that the highest T_c values approaching room temperature may occur in bundles of nanotubes filled by 1D arrays of externally doped C₆₀ or La@C₆₀, or in diluted 3D crystals, where quasi-1D arrangements of C₆₀ form percolation paths.