Magnetoresistance of an entangled single-wall carbon-nanotube network

Gyu-Tae Kim, E. S. Choi, D. C. Kim, D. S. Suh, Y. W. Park, K. Liu, G. Duesberg, S. Roth

Research output: Contribution to journalArticle

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Abstract

The resistivity ρ(T) and magnetoresistance (MR) (Δρ/ρ) of an entangled single-wall carbon-nanotube network are investigated. The temperature dependence of the resistivity shows a negative dρ/dT from T =4.3-300 K with no resistivity minimum, which is fitted well to the two-dimensional variable-range-hopping (VRH) (ρ(T)=ρ 0exp[(T 0/T) 1/3]) formula with T 0=259.2 K. The MR shows a negative H 2 behavior at low magnetic field. At T÷≤3.8 K and high magnetic field, the negative MR becomes positive. The positive MR tends to be saturated for H>10 T. The negative MR with a positive upturn can be decomposed into a positive contribution from the two-dimensional spin-dependent VRH and a negative contribution from the two-dimensional weak localization, with some contribution of the Ni impurities in the sample found with the transmission electron microscope and by energy dispersive spectrometer analysis.

Original languageEnglish
Pages (from-to)16064-16069
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number24
Publication statusPublished - 1998 Dec 15
Externally publishedYes

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Carbon Nanotubes
Magnetoresistance
Carbon nanotubes
carbon nanotubes
electrical resistivity
dependent variables
magnetic fields
Magnetic fields
electron microscopes
spectrometers
impurities
temperature dependence
Spectrometers
Electron microscopes
Impurities
energy
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Kim, G-T., Choi, E. S., Kim, D. C., Suh, D. S., Park, Y. W., Liu, K., ... Roth, S. (1998). Magnetoresistance of an entangled single-wall carbon-nanotube network. Physical Review B - Condensed Matter and Materials Physics, 58(24), 16064-16069.

Magnetoresistance of an entangled single-wall carbon-nanotube network. / Kim, Gyu-Tae; Choi, E. S.; Kim, D. C.; Suh, D. S.; Park, Y. W.; Liu, K.; Duesberg, G.; Roth, S.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 58, No. 24, 15.12.1998, p. 16064-16069.

Research output: Contribution to journalArticle

Kim, G-T, Choi, ES, Kim, DC, Suh, DS, Park, YW, Liu, K, Duesberg, G & Roth, S 1998, 'Magnetoresistance of an entangled single-wall carbon-nanotube network', Physical Review B - Condensed Matter and Materials Physics, vol. 58, no. 24, pp. 16064-16069.
Kim, Gyu-Tae ; Choi, E. S. ; Kim, D. C. ; Suh, D. S. ; Park, Y. W. ; Liu, K. ; Duesberg, G. ; Roth, S. / Magnetoresistance of an entangled single-wall carbon-nanotube network. In: Physical Review B - Condensed Matter and Materials Physics. 1998 ; Vol. 58, No. 24. pp. 16064-16069.
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