AMORPHOUS CARBON FILMS: CONDUCTION ACROSS METAL/CARBON/METAL SANDWICHES.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF PHYSICS
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Very thin films of evaporated carbon were deposited on various metallic thin film and single crystal substrates to form metal-carbon-metal sandwiches. Electrical conductivity measurements through the carbon, over a range of temperatures from room temperature to below 1K, show that conduction is a complicated process of mechanisms dependent on the presence of both structural and impurity defects. At low temperatures, conductivity appears to be independent of temperature, and the carbon films may act as tunneling barriers of effective heights 30 - 100 meV. These heights can be engineered by suitable choices of evaporation and substrate conditions. Any explanation of conduction in these films remains speculative at best. Author
- Electricity and Magnetism