Magnetotransport in bundles of intercalated carbon nanotubes

Two types of quantum magnetotransport behavior were observed in pristine bundles of helicoidal carbon nanotubes. Universal conductance fluctuations for $T<\mathrm{}10\mathrm{}$ K and an underlying positive magnetoconductance to very high magnetic fields for $T<\mathrm{}100\mathrm{}$ K are the most notable features of one of these types. Remarkably, this behavior was observed after intercalation of potassium guest atoms into pristine bundles of the other type. This range of phenomena is explained within the theory of weak localization and interaction effect in three dimensions. However, the observed inelastic scattering mechanism for K-intercalated bundles cannot be described by the present theory for a common mechanism of the same dimensionality.