Magnetoresistive properties of Ni-doped La0.7Sr0.3MnO3 manganites
来源期刊：Rare Metals2016年第7期
论文作者：Ahmed Mohamed Ahmed Abd El-Moez Ahmed Mohamed Medhat Abdelrady Abdellateef Hassan Ahmed Abd El-Ghanny
文章页码：551 - 558
摘 要：La0.7Sr0.3Mn1-xNixO3（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（Tms） and relatively enhances the room temperature magnetoresistance（MR）, especially in x = 0.025 and around Tms. 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.
Ahmed Mohamed Ahmed，Abd El-Moez Ahmed Mohamed，Medhat Abdelrady Abdellateef，Hassan Ahmed Abd El-Ghanny
Physics Department,Faculty of Science,Sohag University
摘 要：La0.7Sr0.3Mn1-xNixO3（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（Tms） and relatively enhances the room temperature magnetoresistance（MR）, especially in x = 0.025 and around Tms. 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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