The conductance and the current-voltage characteristics of metallic single wall carbon nanotube bundles have been measured between 4.2 and 330 K using 10–30 ns electric pulses to avoid overheating. The current-voltage characteristics at different temperatures collapse to a single curve when plotted in the specific coordinates following from the Tomonaga–Luttinger (T–L) liquid concept. Direct evidence is obtained for the existence of a T–L liquid phase up to 190 K and the system shows a transition between the T–L liquid state and a Mott insulating phase below 25 K.

Stability of the Tomonaga-Luttinger liquid state in gamma-irradiated carbon nanotube bundles. Physics: Condensed Matter, 25(47) Abstract. We report experimental results for the changes in conductivity of single-wall carbon nanotube bundles when irradiatiated by 60 Co  -rays in various environments. In the current study the samples investigated were irradiated in hermetic cells, either evacuated (0.1 Pa) or filled with hydrogen or deuterium at atmosphere pressure. In situ measurements of the resistance change as a function of irradiation dose at room temperature are presented. It was found that for all irradiation conditions, the normalized resistance versus irradiation dose demonstrates a logarithmic behaviour. A phenomenological model for the observed dependence is derived. The current-voltage characteristics of the irradiated samples were measured in the temperature range from 4.5 to 300 K using short (10 ns) electric pulses and the results demonstrate a scaling behaviour. This scaling occurs in the universal coordinates that correspond to the Tomonaga-Luttinger liquid concept. The results obtained confirm the existence of the Tomonaga-Luttinger liquid phase up to room temperature in carbon nanotubes after  -irradiation to a dose of 5x10 7 rad in vacuum, 1.7x10 7 rad in hydrogen and 1.24x10 8 rad in deuterium. Journal of

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