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| 制备压力对La2/3Sr1/3MnO3的磁电阻效应的影响 | |
| 引用本文： | 唐雁坤,隋郁,千正男,刘玉强,许大鹏,苏文辉.制备压力对La2/3Sr1/3MnO3的磁电阻效应的影响[J].高压物理学报,2004,18(1):36-39. |
| 作者姓名： | 唐雁坤 隋郁 千正男 刘玉强 许大鹏 苏文辉 |
| 作者单位： | 1. 哈尔滨工业大学理学院凝聚态科学与技术研究中心,黑龙江,哈尔滨,150001;吉林大学物理学院凝聚态物理系,吉林,长春,130023 2. 哈尔滨工业大学理学院凝聚态科学与技术研究中心,黑龙江,哈尔滨,150001 3. 吉林大学物理学院凝聚态物理系,吉林,长春,130023 |
| 摘 要： | 研究了制备压力对纳米块状样品La2/3Sr1/3MnO3的结构、磁学和电学性质的影响。结果表明：样品的晶粒尺寸随制备压力的增加而变小，且不同样品的磁电阻效应不同。低场磁电阻效应在整个实验温区都随制备压力的升高而变弱，这主要是由制备压力使样品晶粒界面连接更紧密所导致；T<200 K时，高场磁电阻效应随制备压力的升高而变强，T>200 K时，高场磁电阻效应随制备压力的升高反而变弱，这主要是由制备压力改变样品的晶粒尺寸所引起。 |
| 关 键 词： | 低场 高场 磁电阻 尺寸 |
| 文章编号： | 1000-5773(2004)01-0036-04 |
| 收稿时间： | 2003-04-07; |
| 修稿时间： | 2003年4月7日 |
Effect of Preparation Pressure on Magnetoresistance of La2/3Sr1/3MnO3 |
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| TANG Yan-Kun.Effect of Preparation Pressure on Magnetoresistance of La2/3Sr1/3MnO3[J].Chinese Journal of High Pressure Physics,2004,18(1):36-39. | |
| Authors: | TANG Yan-Kun |
| Affiliation: | TANG Yan-Kun~ |
| Abstract: | The effect of preparation pressure on the structural,magnetic and electronic properties has been investigated for nanostructured bulk samples of La_(2/3)Sr_(1/3)MnO_3.The results show that the grain size decreases and magnetoresistance varies with preparation pressure growth.Low-field magnetoresistance weakens in the whole experimental temperature range when preparation pressure increases,which can mainly attribute to strong-link grain boundaries of samples under high preparation pressure.And high-field magnetoresistance gradually becomes stronger at T<200 K, however becomes weaker at T>200 K with the increase of preparation pressure,which can mainly due to the change of grain size caused by preparation pressure. |
| Keywords: | low-field high-field magnetoresistance size |
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