We present a theoretical investigation on electron-phonon superconductivity of honeycomb MX2 layered structures. Where X is one element of the group-IV (C, Si or Ge) and M an alkali or an alkaline-earth metal. Among the studied composition we predict a Tc of 7 K in RbGe2, 9 K in RbSi2 and 11 K in SrC2. All these compounds feature a strongly anisotropic superconducting gap. Our results show that despite the different doping and structural properties, the three families of materials fall into a similar description of its superconducting behavior. This allows us to estimate an upper critical temperature of about 20 K for the class of intercalated group-IV structures, including intercalated graphite and doped graphene.
@article{arxiv.1411.4792,
title = {Superconductivity in intercalated group-IV honeycomb structures},
author = {José A. Flores-Livas and Antonio Sanna},
journal= {arXiv preprint arXiv:1411.4792},
year = {2015}
}