Abstract
The electrical transport properties of the polycrystalline samples La0.7−xPrxBa0.3MnO3 (0≤x≤0.2) have been investigated. Two metal–insulator transitions (TP1 and TP2) are observed in the electrical resistivity. The abnormal transport properties are considered to be a sign of a martensitic transition in the TP2 temperature region. Besides, all the samples clearly reveal the unusual low temperature resistivity minimum, presumably due to the combined effect of weak localization, electron–electron and electron–phonon scattering. The present results are discussed and possible explanations were given based on the related theory and previous reported results.
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