Temperature dependence of electric resistance and magnetoresistance of pressed nanocomposites of multilayer nanotubes with the structure of nested cones |
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Authors: | V. I. Tsebro O. E. Omel’yanovskii E. F. Kukovitskii N. A. Sainov N. A. Kiselev D. N. Zakharov |
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Affiliation: | (1) P. N. Lebedev Institute of Physics, Russian Academy of Sciences, 117924 Moscow, Russia;(2) Kazan Physicotechnical Institute, 420029 Kazan, Russia;(3) A. V. Shubnikov Institute of Crystallography, Russian Academy of Sciences, 177333 Moscow, Russia |
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Abstract: | Bulk samples of carbon multilayer nanotubes with the structure of nested cones (fishbone structure) suitable for transport measurements, were prepared by compressing under high pressure (∼25 kbar) a nanotube precursor synthesized through thermal decomposition of polyethylene catalyzed by nickel. The structure of the initial nanotube material was studied using high-resolution transmission electron microscopy. In the low-temperature range (4.2–100 K) the electric resistance of the samples changes according to the law ln R ∝ (T 0/T)1/3, where T 0∼7 K. The measured magnetoresistance is quadratic in the magnetic field and linear in the reciprocal temperature. The measurements have been interpreted in terms of two-dimensional variable-range hopping conductivity. It is suggested that the space between the inside and outside walls of nanotubes acts as a two-dimensional conducting medium. Estimates suggest a high value of the density of electron states at the Fermi level of about 5×1021 eV−1 cm−3. Zh. éksp. Teor. Fiz. 113, 2221–2228 (June 1998) |
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