We report that entirely end-bonded multi-walled carbon nanotubes (MWNTs) can show superconductivity with the transition temperature Tc as high as 12K that is approximately 40-times larger than those reported in ropes of single-walled nanotubes. We find that emergence of this superconductivity is very sensitive to junction structures of Au electrode/MWNTs. This reveals that only MWNTs with optimal numbers of electrically activated shells, which are realized by the end-bonding, can allow the superconductivity due to inter shell effects.
@article{arxiv.cond-mat/0509466,
title = {High-Tc superconductivity in entirely end-bonded multi-walled carbon nanotubes},
author = {I. Takesue and J. Haruyama and N. Kobayashi and S. Chiashi and S. Maruyama and T. Sugai and H. Shinohara},
journal= {arXiv preprint arXiv:cond-mat/0509466},
year = {2009}
}