Magnetic and magnetoresistive properties of La0.65−xEuxSr0.35MnO3
Magnetic and magnetoresistive properties of La0.65−xEuxSr0.35MnO3
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DOI：
10.1016/j.ceramint.2007.11.004
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发表时间：
2009
影响因子：
5.2
通讯作者：
M. Feng;Hai-bo Li;Mei Liu;Na Li;W. Zheng
中科院分区：
文献类型：
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作者：
M. Feng;Hai-bo Li;Mei Liu;Na Li;W. Zheng
以柠檬酸为原料，采用溶胶-凝胶法合成了eu掺杂钙钛矿La0.65−xEuxSr0.35MnO3(0.05≤x≤0.30)，并通过x射线衍射、磁化、电阻率和磁阻（MR）实验对其进行了表征。所有样品均具有单一的六方钙钛矿结构。当x从0.05增加到0.30时，样品的居里温度tc从352降低到242K。结果表明，随着温度的升高，电阻率出现两个拐点，当施加20kOe的磁场时，在室温300K下，x=0.20的La0.65−xeuxsr0.35 mno3的最大磁电阻率为18%。对样品的转变机理进行了探讨。
Eu-doped perovskites La0.65−xEuxSr0.35MnO3(0.05≤x≤0.30) were synthesized by sol–gel method using citric acid and characterized by X-ray diffraction, magnetization, resistivity and magnetoresistance (MR) experiments. All samples had a single hexagonal perovskite structure. As x increased from 0.05 to 0.30, the Curie temperature TCfor the samples decreased from 352 to 242K. It was found that two transition points appeared when the resistivity changed with increasing temperature, and upon an application of a magnetic field of 20kOe the maximum magnetoresistivity of 18% for the La0.65−xEuxSr0.35MnO3with x=0.20 was obtained at room temperature 300K. The mechanism of the transitions for the samples was explored.