Abstract
The electrical transport properties of the polycrystalline samples La0.7-xPrxBa0.3MnO3 (0 <= x <= 0.2) have been investigated. Two metal-insulator transitions (T-P1 and T-P2) are observed in the electrical resistivity. The abnormal transport properties are considered to be a sign of a martensitic transition in the T-P2 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. (C) 2014 Elsevier B.V. All rights reserved.