| La_(0.85)Na_(0.15)MnO_3的结构、磁性质和输运性质 |
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| 引用本文： | 李志青,姜恩永,刘新典,任世伟,白海力.La_(0.85)Na_(0.15)MnO_3的结构、磁性质和输运性质[J].天津大学学报(自然科学与工程技术版),2001(5). |
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| 作者姓名： | 李志青 姜恩永 刘新典 任世伟 白海力 |
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| 作者单位： | 天津大学理学院!天津300072(李志青，姜恩永，任世伟，白海力)，河北工业大学应用物理系!天津300130(刘新典) |
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| 摘 要： | 实验研究了由 Pechini方法制备的 L a0 .85Na0 .1 5Mn O3多晶陶瓷样品的结构、磁性质和输运性质 .发现 L a0 .85Na0 .1 5Mn O3的居里温度正好接近室温 ,在该温度附近 ,伴随铁磁相到顺磁相的转变 ,同时发生金属 -半导体转变 ,且在居里温度附近 ,0 .5 T外磁场下的最大磁电阻可达 14 % .理论与实验对比可知 ,在居里温度以上小极化子非对角跳跃为主要导电机制 .
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| 关 键 词： | 磁电阻 双交换 金属-半导体转变 极化子 |
STRUCTURE,MAGNETIC AND TRANSPORT PROPERTIES OF La_(0.85)Na_(0.15)MnO_3 CERAMICS |
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| LI Zhi qing ,JIANG En yong ,LIU Xin dian ,REN Shi wei ,BAI Hai li.STRUCTURE,MAGNETIC AND TRANSPORT PROPERTIES OF La_(0.85)Na_(0.15)MnO_3 CERAMICS[J].Journal of Tianjin University(Science and Technology),2001(5). |
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| Authors: | LI Zhi qing JIANG En yong LIU Xin dian REN Shi wei BAI Hai li |
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| Institution: | LI Zhi qing 1,JIANG En yong 1,LIU Xin dian 2,REN Shi wei 1,BAI Hai li 1 |
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| Abstract: | Polycrystalline La 0.85 Na 0.15 MnO 3 ceramics were prepared by Pechini process and their structure,magnetic and transport properties have been investigated.The Curie temperature,at which a transition from metallic to semiconducting occurs along with the transition from ferromagnetic to paramagnetic,is just in the vicinity of room temperature.In addition,a low field magnetoresistance about 14% at 0.5 T was observed near the Curie temperature.The small polaron hopping is considered to be the main transport mechanism above the Curie temperature by comparing the experimental data with the theoretical results. |
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| Keywords: | magnetoresistance double exchange metal semiconductor transition polaron |
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