| 低含量La_（1-x）Ca_xMnO_3的电输运及超声衰减性质 |
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| 引用本文： | 黄晓桦,林洪沂,孟宪国,李爱玉. 低含量La_（1-x）Ca_xMnO_3的电输运及超声衰减性质[J]. 厦门理工学院学报, 2013, 0(2): 52-55 |
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| 作者姓名： | 黄晓桦 林洪沂 孟宪国 李爱玉 |
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| 作者单位： | [1]厦门理工学院光电与通信工程学院,福建厦门361024 [2]福建省高校光电技术重点实验室,福建厦门361024 |
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| 基金项目： | 厦门理工学院高层次引进人才科技项目（YJK10014R、YJK10011R） |
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| 摘 要： | 为研究钙钛矿锰氧化物中电-声子耦合作用,采用共沉淀法制备La1-xCaxMnO3（0.25≤x≤0.45）块材.利用Keithley 220可编程电阻测量系统、超声衰减测量系统、超导量子干涉仪等,系统研究了体系的电输运行为和超声衰减性质.结果表明：体系的铁磁相变温度、金属-绝缘转变温度以及出现超声衰减行为异常的温度相近,室温下声速相对变化值大于1%.这是Zener双交换作用机制和电-声子耦合共同作用的结果.
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| 关 键 词： | La1-xCaxMnO3 超声衰减 电输运 铁磁转变 电-声子耦合 |
Electric Transport Property and Ultrasonic Behavior of La1-xCaxMnO3 with Low Doping Level |
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| Huang Xiao-hua,Lin Hong-yi,Meng Xian-guo,Li Ai-yu. Electric Transport Property and Ultrasonic Behavior of La1-xCaxMnO3 with Low Doping Level[J]. Journal of Xiamen University of Technology, 2013, 0(2): 52-55 |
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| Authors: | Huang Xiao-hua Lin Hong-yi Meng Xian-guo Li Ai-yu |
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| Affiliation: | 1. School of Mathematics ＆ Physics, Xiamen University of Technology, Xiamen 361024, China; 2. Key Laboratory of Optoelectmnic Technology for Fujian Universities, Xiamen 361024, China) |
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| Abstract: | The bulk samples La1-xCaxMnO3（0.25≤x≤0.45） were prepared by a coprecipitation method, and the transport property and ultrasonic behaviour were studied systemically. The results show that the metal -insulator transition temperatures approximate to the ferromagnetic transition ones where both the sound velocity and attenuation display abnormal behaviours for almost all of the samples, and a velocity increase of more than 1% appears at room temperature. It is suggested that the double exchange mechanism demonstrated by Zener and electron -phonon interaction play important roles in these results. |
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| Keywords: | La1-x CaxMnO3 ferromagnetic transition electronic transport ultrasonic behavior electron-phonon interaction |
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