Showing papers by "Michael S. Fuhrer published in 1998"
TL;DR: In this article, the electrical resistance of single-walled carbon nanotube mats is shown to be nonlinear with a temperature-dependent threshold field for the onset of non-ohmic conduction.
40 citations
01 Aug 1998
TL;DR: In this article, the authors measured the electrical transport properties of single-walled carbon nanotubes (SWNT) as a function of applied electric and magnetic fields, and found that at low temperatures the resistance as the function of temperature follows the Mott variable range hopping (VRH) formula for hopping in three dimensions.
Abstract: We have measured the electrical transport properties of mats of single-walled carbon nanotubes (SWNT) 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 in 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≈650 nm. The magnetoresistance (MR) of SWNT mat samples is large and negative at all temperatures and fields studied, and can be qualitatively described by theories of MR for VRH systems. The Hall coefficient RH is positive and nearly temperature-independent. The sign of RH agrees with the sign of the thermopower. The small magnitude of RH suggests a large carrier density, but may be the result of cancellation of electron and hole terms.
2 citations