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La0.7-xDyxSr0.3MnO3体系的输运行为研究
引用本文:李鸿,张明玉,蔡之让,郭焕银,彭振生,严国清.La0.7-xDyxSr0.3MnO3体系的输运行为研究[J].无机材料学报,2005,20(4):981-987.
作者姓名:李鸿  张明玉  蔡之让  郭焕银  彭振生  严国清
作者单位:宿州学院材料实验室,宿州,234000
基金项目:国家自然科学基金重点项目(19934003);国家重点基础研究发展规划项目(001CB610604)
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一绝缘体相变的现象;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
文章编号:1000-324X(2005)04-0981-07
收稿时间:2004-6-11
修稿时间:2004-7-14

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.Transport Properties in La0.7-xDyxSr0.3MnO3 System[J].Journal of Inorganic Materials,2005,20(4):981-987.
Authors:LI Hong  ZHANG Ming-yu  CAI ZHI-RANG  GUO HUAN-YIN  PENG Zhen-Sheng  YAN Guo-qing
Affiliation:MaterialsLaboratory;SuzhouCollege;Suzhou234000;China
Abstract:The influence of Dy doping at La-site on transport properties of La0.7-xDyxSro.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.
Keywords:magnetic structure  transport properties  colossal magnetoresistance effect
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