Superconducting diamagnetic fluctuations in ropes of carbon nanotubes
M. Ferrier, F. Ladieu, M. Ocio, B. Sacépé, T. Vaugien, V. Pichot, P. Launois, H. Bouchiat
DOI 10.1103/PhysRevB.73.094520 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report low-temperature magnetization measurements on a large number of purified ropes of single wall carbon nanotubes. In spite of a superparamagnetic contribution due to the small ferromagnetic catalytical particles still present in the sample, at low temperature (T<0.5K) and low magnetic field (H<80Oe), a diamagnetic signal is detectable with an amplitude equal to 13 of the total magnetization signal. This low-temperature diamagnetism can be interpreted as the Meissner effect in ropes of carbon nanotubes which have previously been shown to exhibit superconductivity from transport measurements [M. Kociak, A. Y. Kasumov, S. Guéron, B. Reulet, I. I. Khodos, Y. B. Gorbatov, V. T. Kolkov, L. Vaccarini, and H. Bouchiat, Phys. Rev. Lett. 86, 2416 (2001)]. Its amplitude corresponds to a field expulsion of the order 10−3 and is in agreement with simple expectations taking into account the intertube Josephson coupling.
Similar papers
Superconducting diamagnetic fluctuations in ropes of carbon nanotubes
similarity 0.93M. Ferrier et al. · 2005 · arXiv:cond-mat/0511142
Source status unknown — claims are unverified
Transport and magnetic properties in multi-walled carbon nanotube ropes: Evidence for superconductivity above room temperature
similarity 0.89Guo-meng Zhao · 2002 · arXiv:cond-mat/0208197
Source status unknown — claims are unverified