锰位Cu离子掺杂对层状锰氧化物La_(1.2)Ca_(1.8)Mn_2O_7电磁性能的影响  

Effect of Cu Substitution on the Electromagnetism Properties of Layered Perovskite Manganite La_(1.2)Ca_(1.8)Mn_2O_7

作　　者：陈春霞[1,2] 章建辉[1] 钱天[1] 周桃飞[1] 李慧玲[1] 

机构地区：[1]合肥微尺度物质科学国家实验室,中国科学技术大学材料科学与工程系,安徽合肥230036 [2]安庆师范学院物理与电气工程学院

出　　处：《材料科学与工程学报》2005年第1期23-26,共4页Journal of Materials Science and Engineering

摘　　要：研究了Cu离子掺杂对层状钙钛矿结构锰氧化物La1 .2 Ca1 .8Mn2 O7电磁性能的影响。观察到低含量Cu掺杂样品铁磁性减弱 ,出现金属 -绝缘转变与团簇玻璃态行为 ;高含量Cu掺杂样品为绝缘体 ,出现顺磁与自旋玻璃态行为。相对小极化子跃迁模型或热激活半导体带隙模型而言 ,可变程跃迁模型更好地描述了载流子在顺磁状态的电输运机制。The effects of Mn site substitution by Cu on the electromagnetism properties of layered perovskite manganite La_ 1.2Ca_ 1.8Mn_2O_7 were investigated. 5% Cu doping results in appearing of metal-insulator transition, weakening of ferromagnetism, and occurring of cluster glass state. More than 10% Cu doping results in appearing of insulator, disappearing of ferromagnetism, and occurring of spin glass state. The resistivity varies as ρ=ρ_∞ exp (T_0/T) 1/4over a wide range of temperature..

关 键 词：锰氧化物 掺杂 电磁性能 

分 类 号：TM2[一般工业技术—材料科学与工程]