Eur. Phys. J. B (2012) 85: 109
https://doi.org/10.1140/epjb/e2012-20635-0

Regular Article

Weak localization and dimensional crossover in carbon nanotube systems

¹ Dipartimento di Fisica and MINAS Laboratory, Università di Roma “Tor Vergata”, 00133 Roma, Italy
² Dipartimento di Scienze e Tecnologie Chimiche and MINAS Laboratory, Università di Roma “Tor Vergata”, 00133 Roma, Italy

^a e-mail: cirillo@roma2.infn.it

Received: 4 May 2011
Received in final form: 3 January 2012
Published online: 30 March 2012

Abstract

We investigate the effects of magnetic and electric fields on electron wavefunction interactions in single walled carbon nanotube bundles. The magnetoresistance measurements performed at 4.2 K and the dependence of the data upon the electric field reveal good agreement with weak localization theory. An electrical field conditioned characteristic length is associated to ohmic-non ohmic transition, observed below 85 K, in current voltage characteristics. This length results equal to the average bundles diameter just at T ≅ 85 K, indicating that 2D-3D crossover is responsible for the observed conductance transition.