Abstract
The temperature dependence of the dc conductivity has been studied in evaporated amorphous carbon films. The conductivity is proportional to T n with n=2−3 below room temperature. This nonactivated temperature dependence cannot be explained by motility-edge conduction or variable-range hopping. The nonpolaronic multiphonon hopping of π electrons between π-bonded clusters is suggested to be the dominant transport mechanism.
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