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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

La0.7-xDyxSr0.3MnO3体系的输运行为研究

李鸿; 张明玉; 蔡之让; 郭焕银; 彭振生; 严国清   

  1. 宿州学院材料实验室, 宿州 234000
  • 收稿日期:2004-06-11 修回日期:2004-07-14 出版日期:2005-07-20 网络出版日期:2005-07-20

Transport Properties in La0.7-xDyxSr0.3MnO3 System

LI Hong; ZHANG Ming-Yu; CAI Zhi-Rang; GUO Huan-Yin; PENG Zhen-Sheng; YAN Guo-Qing   

  1. Materials Laboratory; Suzhou College; Suzhou 234000; China
  • Received:2004-06-11 Revised:2004-07-14 Published:2005-07-20 Online:2005-07-20

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摘要： 研究了La位Dy掺杂对La0.7-xDyxSr0.3MnO3(x=0.00、0.10、0.15、0.20、0.30、0.40、0.50、0.60、0.70)体系输运行为的影响.实验结果表明:随Dy掺杂的增加, 体系由长程铁磁有序向自旋团簇玻璃态、反铁磁状态转变.高掺杂时的输运性质在其磁背景下发生异常,在x=0.50时,发现了在ABO3结构中很少出现过的在Tc附近发生绝缘体-金属相变之后又发生从金属-绝缘体相变的现象;对x=0.60、0.70,在远离Tc的温区体系表现为绝缘体.

关键词: 磁结构, 输运行为, 庞磁电阻效应

Abstract: The influence of Dy doping at La-site on transport properties of La0.7-xDyxSr0.3MnO3
(x=0.00, 0.10, 0.15, 0.20, 0.30, 0.40, 0.50, 0.60, and 0.70) was studied. The experimental results indicate that with increasing Dy doping, the system
undergoes a transition from long range ferromagnetic order to the cluster-spin glass state and further to antiferromagnetic order. The transport properties
exhibit abnormal behaviour at high doping condition. For x=0.50, a transition from metal to insulator occurs after the occurrence of
insulator-metal transition near Tc, which seldom occurs in ABO3 structure. The samples of x=0.60 and 0.70, exhibit insulator behavior far
above Tc.

Key words: magnetic structure, transport properties, colossal magnetoresistance effect

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