Nonlinear transport and localization in single-walled carbonnanotubes
We have measured the electrical transport properties of mats of single-walled carbon nanotubes (SWNTs) as a function of applied electric and magnetic fields. We find that at low temperatures the resistance as a function of temperature R(T) follows the Mott variable range hopping (VRH) formula for hopping three dimensions. Measurement of the electric field dependence of the resistance R(E) allows for the determination of the Bohr radius of a localized state a = 700nm. The magnetoresistance (MR) of SWNT mat samples is large and negative at all temperatures and fields studied. The low field negative MR is proportional to H2, in agreement with variable range hopping two or three dimensions. 3D VRH indicates good intertube contacts, implying that the localization is due to the disorder experienced by the individual tubes.The 3D localization radius gives a measure of the 1D localization length on the individual tubes, which we estimate to be>700nm. Implications for the electron-phonon mean free path are discussed.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of Basic EnergySciences. Materials Science Division; National Science Foundation GrantDMR95-20554
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 878511
- Report Number(s):
- LBNL-48755; SYMEDZ; R&D Project: 506701; BnR: KC0202030; TRN: US0602402
- Journal Information:
- Synthetic Metals, Vol. 103; Related Information: Journal Publication Date: June 1999; ISSN 0379-6779
- Country of Publication:
- United States
- Language:
- English
Similar Records
Realizing one-dimensional quantum and high-frequency transport features in aligned single-walled carbon nanotube ropes
Magnetoresistance of PrBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin films