无机材料学报

• 研究论文 • 上一篇    下一篇

La0.75Na0.25MnO3外延膜的制备及磁电特性

韩立安1, 孟泉水1, 常琳1, 廖少俊1, 陈长乐2   

  1. 1. 西安科技大学基础部, 西安 710054; 2. 西北工业大学理学院, 西安 710072
  • 收稿日期:2007-08-17 修回日期:2007-10-15 出版日期:2008-07-20 网络出版日期:2008-07-20

Preparation, Magnetic and Transport Properties of La0.75Na0.25MnO3 Epitaxial Film

HAN Li-An1, MENG Quan-Shui1, CHANG Lin1, LIAO Shao-Jun1, CHEN Chang-Le2   

  1. 1. Department of Basic Courses, Xi’an University of Science and Technology, Xi’an 710054, China; 2. School of Science, Northwestern Polytechnical University, Xi’an 710072, China
  • Received:2007-08-17 Revised:2007-10-15 Published:2008-07-20 Online:2008-07-20

摘要: 通过射频磁控溅射在单晶LaAlO3(100)衬底上生长了膜厚为120nm的La0.75Na0.25MnO3外延膜. 通过X射线衍射、超导量子干涉仪、直流四探针法对其进行了表征. 结果表明, 薄膜为(100)取向外延膜. 居里温度TC=270K, 在居里温度附近, 发生铁磁-顺磁转变. 此材料呈现出典型的自旋玻璃特性, 是由于应力造成的. 在室温附近, 此材料在1T磁场下, 其磁电阻极大值为40.3%. 80K<T<210K时, 其输运机制为电子-电子散射, 电阻率满足ρ=ρ0+ρ1T2+ρ2T5; 220K<TT>TMI时, 其输运机制满足小极化子模型.


关键词: La0.75Na0.25MnO3外延膜, 磁性, 输运特性

Abstract: Using RF magnetron sputtering method, La0.75Na0.25MnO3 film with thickness of 120nm was epitaxially grown on (100) LaAlO3 single-crystal substrate. The thin film was characterized by X-ray diffraction, Superconducting quantum interference device and DC four probed method. The results indicate that the thin film shows a well epitaxial direction of (100) and the Curie temperature is 270K. Near the Curie temperature, the magnetic property shows a transition from ferromagnetic to paramagnetic character. La0.75Na0.25MnO3 thin film exhibits a characteristic spin glass state, which is due to strain effect. The thin film exhibits a quite distinctive magnetoresistance effect which is 40.3% near the Curie temperature when the magnetic field is 1T. Transport properties indicate that the resistivity satisfies the formula of ρ=ρ0+ρ1T2+ρ2T5 from 80K to 210K which is due to electron-electron scattering, the resistivity satisfies phase separate percolation model from 220K to TMI, the resistivity satisfies polarons model when the temperature is above TMI which is due to the existence of the small polarons nearest hopping.

Key words: La0.75Na0.25MnO3 epitaxial film, magnetic property, transport property

中图分类号: