Electrical resistance and magnetoresistance of pyrocarbon at low temperatures in fields up to 14 Tesla Original Research Article

Electrical resistivity measurements in an applied magnetic field B up to 14 T were performed at low temperatures T on several samples of pyrolytic carbon deposited on a substrate of pyrolytic boron nitride. The films were produced in a CVD reactor at 1100°C from a methane/argon gas flow. For B, a maximum is observed in the electrical resistance at low temperatures T≈10 K which has been previously found for carbon fibers. The magnetoresistance in this T region can be separated into an isotropic positive part and an anisotropic negative contribution.