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Superconductivity in ropes of single-walled carbon nanotubes
M Kociak1, A Y Kasumov, S Guéron
1Laboratoire de Physique des Solides, CNRS, Université Paris-Sud, Orsay, France.
Physical Review Letters
|April 6, 2001
Abstract:
We report measurements on ropes of single-walled carbon nanotubes (SWNT) in low-resistance contact to nonsuperconducting (normal) metallic pads, at low voltage and at temperatures down to 70 mK. In one sample, we find a 2 orders of magnitude resistance drop below 0.55 K, which is destroyed by a magnetic field of the order of 1 T, or by a dc current greater than 2.5 microA. These features strongly suggest the existence of superconductivity in ropes of SWNT.