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低掺杂 La0．82Sr0．18MnO3巨磁电阻块材的低频内耗
LOW FREQUENCY INTERNAL FRICTION OF LOW DOPED La0.82Sr0.18MnO3 COLOSSAL MAGNETORESISTANCE BULK MATERIALS
【Author】 LI Heqin CHEN Zhibao School of Materials Science & Engineering,Hefei University of Technology,Hefei 23000 FANG Qianfeng Laboratory of Internal Friction and Defects in Solids,Institute of Solid State Physics,The Chinese Academy of Sciences Hefei 230031
【机构】 合肥工业大学材料科学与工程学院； 中国科学院固体物理研究所内耗与固体缺陷实验室；
【摘要】 用低频扭摆法测试了低掺杂 La0．82Sr0．18MnO3巨磁电阻块材的内耗及弹性模量．所测试的温度范围内,在276和 154 K 存在两个内耗峰,且在相应的温度,模量有明显的变化．结合电磁性能的测试结果,认为高温峰起源于顺磁绝缘体斜方相向铁磁金属斜方相的转变．低温峰则被解释为铁磁金属斜方相向铁磁金属正方相的转变．
【Abstract】 The low frequency internal friction and elastic modulus,together with the electrical and magnetic properties are measured for the La0.82Sr0.18MnO3 colossal magnetoresistance bulk materials. Two internal friction peaks and the corresponding softening of elastic modulus and two resistance peaks are observed around 276 and 154 K.The peaks at high temperature can be ascribed to the PIR to FMR transition,while the peaks at low temperature may be interpreted as a phase transition from FMR to FMO.
【Key words】 internal friction； colossal magnetoresistance； electrical and magnetic property； phase transformation； La0.82Sr0.18MnO3；
- 【会议录名称】 第七届全国内耗学术会议论文集
- 【会议名称】第七届全国内耗学术会议
- 【会议时间】2003-10
- 【会议地点】中国安徽合肥
- 【分类号】O482
- 【主办单位】中国物理学会内耗与超声衰减专业委员会、中国科学院固体物理研究所