Journal of Low Temperature Physics ( IF 2 ) Pub Date : 2021-05-19 , DOI: 10.1007/s10909-021-02598-4 E. Lakhal , A. Amira , R. Chihoub , N. Soylu , S. P. Altintas , A. Varilci , C. Terzioglu
In this work, manganite ceramics of Sm0.7-xCexSr0.3MnO3 (0 ≤ x ≤ 0.3) are prepared by a citrate sol–gel chemical route and characterized. The structure of the obtained samples is refined in the orthorhombic system with the Pnma space group. The doping causes a change in the lattice parameters leading to a decrease in the cell volume. It also increases slightly the grain size of the crystallites. The temperature dependence of resistivity reveals a metal–insulator transition for all samples. The doping shifts the temperature of this transition towards high values. The extracted magnetoresistance for a 5 T magnetic field is enhanced by doping. The highest obtained value increases from 66.70% for x = 0 to 97.96% for x = 0.3.
中文翻译:
溶胶-凝胶法制备的Sm 0.7-x Ce x Sr 0.3 MnO 3锰矿中的改进的磁阻
在这项工作中,锰的陶瓷的Sm 0.7-X的Ce X的Sr 0.3 MnO的3(0 ≤ X ≤ 0.3)是由柠檬酸盐的溶胶-凝胶化学路线制备和表征。获得的样品的结构在具有Pnma空间群的正交系统中得以完善。掺杂导致晶格参数改变,从而导致晶胞体积减小。它也略微增加了微晶的晶粒尺寸。电阻率的温度依赖性揭示了所有样品的金属-绝缘体转变。掺杂将这种转变的温度移向高值。5 T的提取磁阻掺杂可以增强磁场。最高获得的值从增加66.70%为X = 0至97.96%为X = 0.3。