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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* ,Guo-qing Yan ,Su-jun Xu ,Wei Tong
Author NameAffiliationE-mail
Ning Liu* Department of Physics, Suzhou College, Suzhou 234000, China;Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China liuning.szsz@ 163.com  
Guo-qing Yan Department of Physics, Suzhou College, Suzhou 234000, China  
Su-jun Xu Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China  
Wei Tong 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*,严国清,徐素军,童伟
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
分类号: