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Abnormality of Magnetic Behavior and Resistivity of La0.7-xDyxSr0.3MnO3 (0.00 ≤ x ≤ 0.30) System at Low Temperature
Ning Liu*1,2, Guo-qing Yan1, Su-jun Xu2, Wei Tong2
1.Department of Physics, Suzhou College, Suzhou 234000, China;2.Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China
Abstract:
By measuring M-T curves, ρ-T curves and MR-T curves of the samples under different temperatures, the influence of Dy doping (0.00 ≤ x ≤0.30) on the magnetic and electric properties of La0.7-xDyxSr0.3MnO3 has been studied. The experimental results show that, with the increase of the Dy content, the system undergoes a transition from long range ferromagnetic order to the cluster-spin glass state and further to antiferromagnetic order. For the samples with x=0.20 and 0.30, their magnetic behaviors are abnormal at low temperature, and their resistivities at low temperature have a minimum value. These peculiar phenomena not only come from the lattice effect induced by doping, but also from extra magnetic coupling induced by doping.
Key words:  Manganite, Abnormality of resistivity at low temperature, Lattice effect, Extra magnetic coupling
FundProject:
La0.7-xDyxSr0.3MnO3(0.00≤x≤0.30)体系低温磁行为和电阻率的反常
刘宁*1,2, 严国清1, 徐素军2, 童伟2
1.宿州学院物理系,宿州,234000;2.中国科学技术大学结构分析开放实验室,合肥230026
摘要:
通过测量样品的磁化强度-温度曲线、电阻率-温度曲线及磁电阻-温度曲线,研究了Dy掺杂(0.00≤x≤0.30)对La0 7-xDyxSr0.3MnO3体系磁电性质的影响.实验发现,随Dy掺杂量的增加,体系磁结构从长程铁磁有序向自旋团簇玻璃态、反铁磁状态转变;x=0.20、0.30时的低温磁行为发生异常,电行为存在低温电阻率极小值现象.这些奇特现象不仅来源于掺杂引起的晶格效应,也来源于掺杂引起的额外磁性耦合.
关键词:  锰氧化物  低温电阻率反常  晶格效应  额外磁性耦合
DOI:10.1360/cjcp2006.19(2).173.5
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