H2(pc)I is known to have highly anisotropic electronic and structural properties. Electrical conductivity and magnetoresistance measurements have been performed on high purity H2(pc)I single crystals ranging from room temperature to 20 mK in magnetic fields up to 5.5 tesla. We have observed abrupt changes in both measurements around 2 K. Conductivity follows a simple quadratic temperature dependence below 2 K and remains metallic (≈10000 ω-1cm-1) down to very low temperatures, 20 mK. This phenomenon has not been reported previously in quasi-one dimensional conductors. We suggest that H2(pc)I experiences an abrupt dimensional crossover from a 1 dimensional regime to a 3 dimensional one below 2 K.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering