Superconductivity in Ropes of Single-Walled Carbon Nanotubes
  We report measurements on ropes of Single Walled Carbon Nanotubes (SWNT) in low-resistance contact to non-superconducting (normal) metallic pads, at low voltage and at temperatures down to 70 mK. In one sample, we find a two order of magnitude resistance drop below 0.55 K, which is destroyed by a magnetic field of the order of 1T, or by a d.c. current greater than 2.5 microA. These features strongly suggest the existence of superconductivity in ropes of SWNT. 
M. Kociak, A.Yu. Kasumov, S. Gueron, B. Reulet, L. Vaccarini, I.I.   Khodos, Yu.B.Gorbatov, V.T. Volkov, H. Bouchiat