Abstract
The electromagnetic properties of a bulk sample of high quality single-wall carbon nanotubes with a mean diameter of were investigated by noninvasive methods. The observed sudden increase in the microwave absorptivity below is taken as indicative of the formation of a superconducting phase of a small part of the sample. The increase in the ac susceptibility peaking at points to the existence of a weak ferromagnetism probably of a different set of tubes in the heterogeneous sample. Above , the microwave loss function apparently originates predominantly from a narrow-band-gap one-dimensional conductor.
2 More- Received 9 February 2007
DOI:https://doi.org/10.1103/PhysRevB.75.235416
©2007 American Physical Society