Abstract
Dc conductivity, Hall effect, and optical absorption measurements were performed on Cu-GeO 2 thin films to elucidate the dc conduction mechanism. The dc activation energy is temperature dependent, increasing significantly above a transition temperature T t . Hall mobility exhibited a sign reversal around T t , above which it increased to a maximum value at a critical temperature T c . The almost identical transition temperatures in conductivity and Hall mobility suggest that the conductivity results from a combination of two processes. Above T t , the conductivity is best described by small polaron phonon-assisted hopping model; hopping appears to be non-adiabatic in nature. Below T t , the conductivity is weakly activated, magnetoresistance is negative, and the Hall mobility shows a significant rise with decreasing temperature. These are features which suggest non-polaronic thermally activated hopping through a spectrum of localized states. Various parameters associated with polaron formation are calculated.
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