La_(2/3)Ca_(1/3)MnO_3中的输运机制与CMR效应  

Transport Properties and CMR Effect in La_(2/3)Ca_(1/3)MnO_3

作　　者：彭振生[1] 

机构地区：[1]宿州师范专科学校物理系,安徽宿州234000

出　　处：《中国稀土学报》2003年第6期664-667,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金重点项目(19934003);国家重点基础研究发展规划项目(001CB610604)

摘　　要：研究了超大磁阻材料La2 3Ca1 3MnO3的磁电特性,发现由电阻测量得到的绝缘体 金属相变与由磁化曲线得到的顺磁 铁磁相变温区完全一致,均随磁场的增强推向高温区。结果证明样品输运行为的变化起因于磁结构的变化,在TC附近产生超大巨磁电阻效应。The magnetic and electrical transport properties of the colossal magnetoresistance material La_(2/3)Ca_(1/3)MnO_3 were studied. It is found that the insulator-metal transition is well consistent with the paramagnetic-ferromagnetic transition, and shits to higher temperature with increasing applied magnetic field. These results suggest that the transport properties are triggered by the magnetic structure transition and consequently resulting in a CMR near T_C.

关 键 词：凝聚态物理 绝缘体-金属相变 超大磁阻效应 顺磁-铁磁相变 稀土 LA2/3CA1/3MNO3 输运机制 CMR效应 超大磁阻材料 

分 类 号：O482.5[理学—固体物理]