paper

Towards room-temperature superconductivity in low-dimensional C60 nanoarrays: An ab initio study

arXiv:1803.10312 · doi:10.1103/PhysRevB.97.140505

Abstract

We propose to raise the critical temperature $T_{c}$ for superconductivity in doped C $_{60}$ 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 C $_{60}$ 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 $t_{1 u}$ derived frontier bands with decreasing coordination number of C $_{60}$ . Whereas a significant increase of $N (E_{F})$ occurs in 2D arrays of doped C $_{60}$ 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 C $_{60}$ or La@C $_{60}$ , or in diluted 3D crystals, where quasi-1D arrangements of C $_{60}$ form percolation paths.

Accepted as Phys. Rev. B rapid communication