Abstract
Magneto-transport and magnetic studies carried out on the(1−x)Pr2/3Ba1/3MnO3+xAg2O (x = 0–30 mol%) composite system are reported here. Two transitions(TP1 and TP2) are observed in the electrical resistivity of the pristinePr2/3Ba1/3MnO3 (PBMO) system. Withaddition of Ag2O electricalresistivity decreases. While TP1 gets sharper, TP2 disappearswith increasing Ag2O content. Electrical resistivity fitting belowTP2 indicates that PBMO exhibits a crossover from a spin dependent scattering-like polycrystallinematerial to a single crystalline material in composites. Low temperature resistivity upturn,which results from the combined effect of weak localization, electron–electron andelectron–phonon scattering mechanisms, also decreases in the composite materials. Theenhanced intrinsic magneto-resistance seen in the composite system has been ascribed tofactors like decrease in electrical resistivity due to the formation of metallic Ag fromAg2O dissociation, disorder reduction, magnetic inhomogeneity and growth of spin clusters. Themonotonic decrease in the extrinsic magneto-resistance due to Ag is found to berelated to the disappearance of the energy barrier formed at the grain boundary.The observed decrease in the magnetization below the Curie temperature(TC) is considered vis-à-vis the magnetic volume reduction and the non-magnetic Ag acting as apinning centre to the domain rotation.
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