On the possible reason for superconductivity strengthening in multiwall carbon nanotubes
Yu.B. Gaididei and V.M. Loktev
Bogolyubov Institute for Theoretical Physics, 14 B Metrologichna Str., Kiev 01413, Ukraine
Received April 17, 2006
Basing on the structural peculiarity of two-layer graphene which consists of translational and energetical nonequivalency of carbon atoms from different sublattices, it is shown that the density of long-wave electronic states at the Fermi level is finite (in contrast to the monolayer
graphene). It is suggested that the same may be the reason why the critical temperature of superconducting transition in multiwall nanotubes more than ten times higher than in single-wall
nanotubes.PACS: 71.23.-k - Electronic structure of disordered solids 71.21.Ac - 81.05.Uw - Carbon, diamond, graphite
Key words: graphene, quantum Hall effect, unconventional Hall effect.