LaMnO_3不同晶位掺杂的磁电阻效应  

Magnetoresistance Effect of Different Element Substitution in La-Site and Mn-Site of LaMnO_3

作　　者：任清褒[1] 

机构地区：[1]丽水师范专科学校物理系,丽水323000

出　　处：《西安交通大学学报》2004年第6期645-648,656,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(1 0 2 740 70 )

摘　　要：基于研究钙钛矿型氧化物磁电阻效应的目的,采用固相反应法制备了实验所需的单相多晶样品,主要就La位二价金属离子掺杂和稀土互掺及Mn位掺杂对LaMnO3磁电阻影响的实验结果作比较研究,发现La位稀土互掺对磁电阻的影响可以用晶格效应来解释,并明确指出La位和Mn位掺杂是提高和调制钙钛矿型锰氧化物超大磁电阻效应的一种有效途径.Single-phase polycrystalline samples were prepared by conventional solid-state reaction method to study magnetoresistance effect of perovskite oxide. The experimental results for the influence of divalent metallic ions and rare earth elements mutual substitution in La-site and different element substitution in Mn-site on the magnetoresistance effect of LaMnO3 were investigated comparatively. It is shown that the influence of rare earth elements substitution in La-site on the magnetoresistance effect can be explained by the lattice effects, and the substitution in La-site and Mn-site is an efficient method for promoting and modulating the CMR effect of perovskite Mn oxide.

关 键 词：钙钛矿型 La位和Mn位掺杂 双交换作用 CURIE温度 超大磁电阻效应 

分 类 号：O513[理学—低温物理]