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TT: Fachverband Tiefe Temperaturen

TT 99: Superconductivity: (General) Theory 2

TT 99.3: Talk

Thursday, March 19, 2015, 15:30–15:45, H 2053

Superconductivity in intercalated group-IV honeycomb structures — •Jose A. Flores Livas and Antonio Sanna — Max-Planck-Institut für Mikrostrukturphysik. Weinberg 2, 06120. Halle (Saale) Germany.

We present in this talk 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 compositions we predict a T_c of 7 K in RbGe₂, 9 K in RbSi₂ and 11 K in SrC₂. Our SCDFT calculations evidence a strongly anisotropic superconducting gap, and the 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.