Abstract
Variable range hopping (VRH) conduction of the Mott type, where the electrical resistivity (ρ) follows the law (ln(ρ)∝T1/4), is observed in Strontium (Sr) doped Calcium Copper Titanate (CCTO) ceramics below 170 K at different frequency values up to 1 MHz. Two different methods of a) minimizing the percentage deviation between experimental data of ρ and equation (ρ=ρoexp(ToT)p) with the exponent p varying between zero to 1 and b) of analyzing the local activation energy (Eloc(T)) are used to confirm the Mott-VRH mechanism in these ceramics. The effect of frequency on the pre-exponential factor ρo, the localization temperature To and thus on the localization length ξ of charge carriers is analyzed.
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