Nd_(0.5)Sr_(0.4)Pb_(0.1)Mn_(0.96)Fe_(0.04)O_3氧化物的结构和磁性  

Structure and Magnetic Properties of Nd_(0.5)Sr_(0.4)Pb_(0.1)Mn_(0.96)Fe_(0.04)O_3 Manganites

作　　者：鲁毅[1] 浩斯巴雅尔[1] 邢茹[1] 赵建军[1] 金香[1] 刘克杰[1] 郭景[1] 

机构地区：[1]内蒙古科技大学包头师范学院物理系,内蒙古包头014030

出　　处：《稀土》2008年第3期68-71,共4页Chinese Rare Earths

基　　金：内蒙古自治区科学基金资助项目(200607010102)

摘　　要：通过室温下的中子衍射和磁性测量对多晶样品Nd0.5Sr0.4Pb0.1Mn0.96Fe0.04O3的结构和磁性进行了实验研究。中子衍射结果表明,该样品具有正交的钙钛矿结构,空间群是Pnma,即结构发生了晶场畸变;由M-T和R-T曲线可知,居里温度Tc=182K,其磁性是随着温度的增加样品经历了从铁磁金属态转变到顺磁半导态,且转变温度Tp=105K;用锰氧化物晶场和双交换作用的竞争解释了其室温下的金属特性。Structure and magnetic properties of polycrystalline Nd0.5Sr0.4Pb0.1Mn0.96Fe0.04O3 were experimentally studied by neutron powder diffraction at room temperature and malefic measurement. The result shows that the samples have pemvskite - type structure and the space group is Pnma. Its Curie temperature Tc equals 182K. R - T curve shows a transition of ferromagnetic metal state to paramagnetic semiconductor state with temperature increasing and Tp = 105K. The metal property at room temperature was explained by competing between manganite crystal field and double exchange interaction.

关 键 词：锰氧化物 晶场畸变 结构 磁性 转变温度Tp 双交换作用 

分 类 号：O482.52[理学—固体物理] O614.33[理学—物理]