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Magnetoresistive properties of Ni-doped La0.7Sr0.3MnO3 manganites

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Abstract

La0.7Sr0.3Mn1−x Ni x O3 (x = 0, 0.025, 0.050 and 0.075) ceramics were prepared by the conventional solid-state reaction method. The partial substitution of Mn by Ni2+ leads to a decrease in cell volume as well as a structural transition from the rhombohedral to the orthorhombic structure. Ni2+ doping increases the electrical resistivity, decreases the semiconductor–metal transition temperature (T ms) and relatively enhances the room temperature magnetoresistance (MR), especially in x = 0.025 and around T ms. With respect to conduction mechanism, the small polaron hopping (SPH) and the variable range hopping (VRH) models were used to examine conduction in the semiconducting region.

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Acknowledgments

This work was financially supported by Sohag University in Egypt. The authors also would like to thank H F Mohamed for his continuous help.

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Authors and Affiliations

  1. Physics Department, Faculty of Science, Sohag University, Sohâg, 82524, Egypt

    Ahmed Mohamed Ahmed, Abd El-Moez Ahmed Mohamed, Medhat Abdelrady Abdellateef & Hassan Ahmed Abd El-Ghanny

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  1. Ahmed Mohamed Ahmed
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  2. Abd El-Moez Ahmed Mohamed
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  3. Medhat Abdelrady Abdellateef
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Correspondence to Abd El-Moez Ahmed Mohamed.

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Ahmed, A.M., Mohamed, A.EM.A., Abdellateef, M.A. et al. Magnetoresistive properties of Ni-doped La0.7Sr0.3MnO3 manganites. Rare Met. 35, 551–558 (2016). https://doi.org/10.1007/s12598-015-0465-x

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