Superconductivity in bundles of a mixture of doped carbon nanotubes
  Using inhomogeneous Bogoliubov-de Gennes formalism we study superconducting properties of bundles of single wall carbon nanotubes, consisting of a mixture of metallic and semiconducting nanotubes, having different critical transition temperatures. We investigate how the averaged superconducting order parameter and the critical transition temperature depend on the fraction of semiconducting carbon nanotubes in the bundle. 
Ilya Grigorenko, Anvar Zakhidov
cond-mat.supr-con