Study of magnetization and transport properties in La0.7Pb0.3MnO3with the addition of nonmagnetic Ag

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Abstract

Magnetization and transport properties of Ag containing La0.7Pb0.3MnO3+x wt% Ag (x=0-20) system have been reported. The samples with high Ag content (x>10), Ag phase is observed along with the perovskite structure. Presence of non-magnetic Ag in La0.7Pb0.3MnO3decreases the d.c magnetization along with increase of ferromagnetic Curie temperature. All the samples show metal-insulator transition (MIT) with peaks at the MIT temperatures (Tp∼ 240-340K depending on Ag content). Resistivity (ρ) decreases and Tpincrease with increase of Ag content. For higher concentration of Ag (>10wt%) decrease of ρ is small and Tpremains almost constant. Magnetoresistance ratio [MRR=-(ρ1.5T-ρ0T)/ρ0T)] also decreases with increasing Ag concentration. In the semiconducting regime (above Tp), resistivity data can be well fitted with small polaron hopping (SPH) model. Activation energy calculated from the SPH model decreases with Ag content. In the low temperature phase (T<Tp), T2dependency of resistivity is observed prominent than T2.5dependency for the samples with Ag≥5wt%, indicating the appearance of strong electron-electron interaction in La0.7Pb0.3MnO3+x Ag system. Present study indicates the importance of both electron-electron and electron-magnon interactions for explaining transport properties in low temperature phase (T<Tp) of the present La-Pb-Mn-O+Ag system. © 2003 Elsevier Ltd. All rights reserved.

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Pal, S., Banerjee, A., & Chaudhuri, B. K. (2003). Study of magnetization and transport properties in La0.7Pb0.3MnO3with the addition of nonmagnetic Ag. In Journal of Physics and Chemistry of Solids (Vol. 64, pp. 2063–2067). https://doi.org/10.1016/S0022-3697(03)00119-7

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