H. Stahl, J. Appenzeller, R. Martel, Ph. Avouris, B. Lengeler
Published 2000-03-27Version 1
We investigate the coupling between individual tubes in a rope of single-wall carbon nanotubes using four probe resistance measurements. By introducing defects through the controlled sputtering of the rope we generate a strong non-monotonic temperature dependence of the four terminal resistance. This behavior reflects the interplay between localization in the intentionally damaged tubes and coupling to undamaged tubes in the same rope. Using a simple model we obtain the coherence length and the coupling resistance. The coupling mechanism is argued to involve direct tunneling between tubes.
Comments: 5 pages, 3 figures, submitted to Phys. Rev. Lett
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