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La0.67Pb0.33MnO3的磁性及输运特性

肖春涛 韩立安 薛德胜 赵俊慧 H.Kunkel G.Williams

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La0.67Pb0.33MnO3的磁性及输运特性

肖春涛, 韩立安, 薛德胜, 赵俊慧, H.Kunkel, G.Williams

Magnetic and transport properties of perovskite La067Pb033MnO3

Xiao Chun-Tao, Han Li-An, Xue De-Sheng, Zhao Jun-Hui, H.Kunkel, G.Williams
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  • 利用固相反应烧结法制备了La067Pb033MnO3单相多晶样品.研究了其结构、磁性及输运特性.结果表明,样品呈菱面相晶体结构,空间群为R3C,居里温度TC(=353K)非常接近TMI(=360K).在居里温度附近,发生铁磁-顺磁转变,导电特性由金属特征向半导体特征过渡.磁电阻在居里点达到极大值.当H=16T时,磁电阻的极大值为145%;当H=08T时,磁电阻的极大值为9%.输运性质表明,TTMI时
    Singlephase polycrystalline samples of La067Pb033MnO3 were prepared by conventional solidstate reaction method. The crystal structure and magnetic and transport properties are investigated. The structure revealed by the room temperature xray powder diffraction is rhombohedral(R3C), and the Curie temperature is very close to TMI(=360K). At the Curie point, the magnetic properties show the transition from ferromagnetic to paramagnetic, and the conductivity changes from metal to semiconducting. The resistivity decreases with increasing magnetic field. Magnetoresistance reaches a maximum at the Curie point. The maximum magnetoresistance is 14\^5% at H=1\^2MA/m, and 9% at H=0\^6MA/m. The transport results show that the transport data satisfy ρ(T)=ρ0+ρT2.5 for TTMI. This phenomenon is due to the magoncarrier scattering.
    • 基金项目: 高等学校重点实验室访问学者基金资助的课题.
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  • 文章访问数:  6289
  • PDF下载量:  610
  • 被引次数: 0
出版历程
  • 收稿日期:  2002-03-26
  • 修回日期:  2002-07-17
  • 刊出日期:  2003-05-20

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