电子顺磁共振研究巨磁电阻锰氧化物La0.67Ca0.33MnO3的顺磁到铁磁的相变

电子顺磁共振研究巨磁电阻锰氧化物La_0.67Ca_0.33MnO₃的顺磁到铁磁的相变

董凤霞¹, 郑荧光¹, 田宏伟², 丁涛², 阚东武², 高彦君², 赵竹弟², 郑伟涛²

1. 吉林大学测试科学实验中心, 长春 130023;2. 吉林大学材料科学与工程学院, 吉林大学汽车材料教育部重点实验室, 长春 130012

收稿日期:2004-03-12 修回日期:1900-01-01 出版日期:2004-10-26 发布日期:2004-10-26
通讯作者: 董凤霞

Electron paramagnetic resonance studies of magnetic transitionin La_0.67Ca_0.33MnO₃ with CMR

DONG Feng-xia¹, ZHENG Ying-guang¹, TIAN Hong-wei^{2, DING Tao², KAN Dong-wu², GAO Yan-jun², ZHAO Zhu-di², ZHENG Wei-tao²}

1. Test Science Experiment Center, Jilin University, Changchun 130023, China;2. College of Materials Science and Engineering, Key Laboratory of Automobile Materials of Ministry of Education,Jilin University, Changchun 130012, China

Received:2004-03-12 Revised:1900-01-01 Online:2004-10-26 Published:2004-10-26
Contact: DONG Feng-xia

摘要/Abstract

摘要： 采用高温固态反应法制备了具有钙钛矿结构的多晶氧化物La_0.67Ca_0.33MnO₃, 利用X射线衍射、电子顺磁共振等实验技术研究其结构和顺磁到铁磁的磁性相转变. 电子顺磁共振实验可以观测到样品在磁有序转变温度 (T_c) 附近的动态磁性相转变, 并且与磁化强度的实验结果一致. 对T_{c附近的磁性相转变进行了分析.}

关键词: 电子顺磁共振, 锰氧化物, 磁相变

Abstract: The colossal magnetoresistance manganite(CMR) La_0.67Ca_0.33MnO₃ was prepared by conventional solid state reaction meth od. The dynamic magnetic transition was investigated by EPR experiment near the Curie temperature T_c, and the results are in agreement with the magne tization experiments. The EPR investigation indicated that the compound was in t he paramagnetic phase above 272 K, whereas it was in the ferromagnetic state bel ow 260 K.

Key words: electron paramagnetic resonance, manganite, magnetic transition

中图分类号:

O482.533

董凤霞, 郑荧光, 田宏伟, 丁涛, 阚东武, 高彦君, 赵竹弟, 郑伟涛. 电子顺磁共振研究巨磁电阻锰氧化物La_0.67Ca_0.33MnO₃的顺磁到铁磁的相变[J]. J4, 2004, 42(04): 591-593.

DONG Feng-xia, ZHENG Ying-guang, TIAN Hong-wei, DING Tao, KAN Dong-wu, GAO Yan-jun, ZHAO Zhu-di, ZHENG Wei-tao. Electron paramagnetic resonance studies of magnetic transitionin La_0.67Ca_0.33MnO₃ with CMR[J]. J4, 2004, 42(04): 591-593.

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电子顺磁共振研究巨磁电阻锰氧化物La_0.67Ca_0.33MnO₃的顺磁到铁磁的相变

Electron paramagnetic resonance studies of magnetic transitionin La_0.67Ca_0.33MnO₃ with CMR

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