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Synthesis and Properties of Pr1-xRbxMnO3 (0.05≤x≤0.08) with Perovskite-Type Structure
王冬,唐凯斌*,梁振华,聂雁翔
Author NameAffiliationE-mail
王冬 Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
唐凯斌* Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China kbtang@ustc.edu.cn 
梁振华 Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
聂雁翔 Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China  
Abstract:
Rb-substitued Pr1-xRbxMnO3 (0.05≤x≤0.08) was successfully synthesized by solid state reaction. Powder X-ray diffraction showed that all the compounds were orthorhombic with the space group of Pnma. Spin glass behaviors were observed for all the compounds at low temperature, suggesting the competition between ferromagnetic and antiferromagnetic. The temperature dependence of the resistivity for the compound Pr0.92Rb0.08MnO3.02 at 0 and 2 T magnetic field was also investigated. The compound shows semiconducting behavior, and the band gap is 0.3 eV. The maximum magnetoresistance is about 30% at 2 T magnetic field near 116 K.
Key words:  Perovskite, Spin glass behavior, Semiconductor, Magnetoresistance
FundProject:
钙钛矿型Pr1-xRbxMnO3 (0.05≤x≤0.08)的合成和性质
Dong Wang,Kai-bin Tang*,Zheng-hua Liang,Yan-xiang Nie
摘要:
将Rb+掺杂到PrMnO3体系,合成出Pr1-xRbxMnO3 (0.05≤x≤0.08),X射线衍射表明该系列化合物都为正交相, 空间群为Pnma. 磁性研究发现, 该系列化合物在高于200 K时符合居里-外斯定律; 在低温时表现出一定的自旋玻璃态的性质, 说明在低温下存在着铁磁和反铁磁的相互竞争. 同时测试了化合物Pr0.92Rb0.08MnO3.02在0和2 T下的电阻-温度曲线,计算出该化合物为半导体带隙约0.3 eV,116 K时其磁阻变化率大,约为30%.
关键词:  钙钛矿,自旋玻璃态,半导体,磁阻效应
DOI:10.1088/1674-0068/23/06/726-730
分类号: