Electrical conductivity of Mo6S3I6 and Mo6S4.5I4.5 nanowires

Electrical conductivity measurements on novel materials composed of bundles of Mo6S3I6 and Mo6S4.5I4.5 nanowires pressed in a sheet form, in the frequency range from 10 Hz to 1 MHz for temperatures between 4 K and 330 K, are reported. Temperature dependence of the quasistatic electrical conductivity show similar dependence at higher temperatures as expected for three-dimensional variable range hopping mechanism with decreasing electrical conductivity as temperature decreases. Below 50 K the electrical conductivity becomes completely temperature independent. It seems that at lower temperatures fluctuation-induced tunnelling mechanism dominates in these nanostructured materials.