Intertube coupling in ropes of single-wall carbon nanotubes
  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. 
H. Stahl (1), J. Appenzeller (1), R. Martel (2), Ph. Avouris (2), B.   Lengeler (1) ((1) RWTH Aachen, Germany, (2) IBM T.J.W...