Abstract
The sol-gel method was adopted to prepare series of La2/3Ca1/3Mn0.98Cu0.02O3 samples sintered at different temperatures, and the structure of samples, high-temperature electrical conductive mechanism and electronic transport properties of double-peak resistance were investigated. X-ray diffraction pattern indicates that the samples are in perovskite structures and obey the Variable-Rang Hopping Mechanism of ρ=ρ0exp[(T0/T)1/4] under high temperatures during the electrical conduction. In addition, based on the polycrystalline granular system surface and image, the reasonable explanation was given for the double-peak resistance phemomenon.
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