Abstract
We develop a new model describing the charge transport process in perovskite like manganites La1−xCaxMnO6for temperatures above the metal-insulator transition temperature Tp. At the x = 0.33 doping level four bipolaronic energy bands are expected to be present into the Jann-Teller energy gap of electronic statese2g. For comparison with experiment the conductivity and magneto-conductivity of La0.67Ca0.33MnO6samples, sintered at temperatures between 700○C and 1100○Cwere determined in the temperature range 4.2 K − 300 K. By analyzing the experimental data of conductivity vs temperature, in the framework of our model we from found the best fit, in the temperature range above TPindications for the presence of small bipolarons even above this temperature.
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