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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

B位的Fe掺杂对LaMnO3电磁特性的影响

蔡之让1, 童伟2, 张贝2, 张裕恒2   

  1. 1. 宿州学院材料研究室, 宿州 234000; 2. 中国科学技术大学结构分析开放实验室, 合肥 230026
  • 收稿日期:2007-01-28 修回日期:2007-03-21 出版日期:2008-01-20 网络出版日期:2008-01-20

Influence of Fe Doping at B Site upon Electric and Magnetic Properties of LaMnO3 System

CAI Zhi-Rang1, TONG Wei2, ZHANG Bei2, ZHANG Yu-Heng2   

  1. 1. Materials Research Laboratory, Suzhou College, Suzhou 234000, China;
    2. Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China
  • Received:2007-01-28 Revised:2007-03-21 Published:2008-01-20 Online:2008-01-20

PDF (PC)

1833

被引次数

3

摘要： 通过测量样品的M-T曲线、ESR曲线、ρ-T曲线和MR-T曲线, 研究了Fe掺杂(x=0.05, 0.10, 0.20, 0.30, 0.40)对LaMnO3磁电性质的影响. 实验结果表明: 随掺杂浓度的增加, 体系的TC单调下降, 所有掺杂样品均有铁磁-顺磁(FM-PM)相变, 但均无金属-绝缘体(IM)转变. 这些结果归因于Fe掺杂引起Fe3+与Mn3+之间的双交换作用和J-T畸变.

关键词: 庞磁电阻, 磁结构, 输运行为, 双交换

Abstract: By measuring M-T curves, ESR curves, ρ-T curves and MR-T curves of the samples,
the influences of Fe doping (x=0.05, 0.10, 0.20, 0.30, 0.40) upon magnetic
and electric properties of LaMnO3 were studied. The experimental results indicate that all samples undergo the transition from paramagnetism to ferromagnetism at TC. For the doped samples, there is a paramagnetic-ferromagnetic (PM-FM) transition but there is no insulator-metal(IM) transition. The results are attributed to double exchange interaction between Fe3+ ions and Mn3+ ions and Jahn-Teller effects.

Key words: colossal magnetoresistance effect, magnetic structure, transport behaviors, double exchange

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