层状钙钛矿钴氧化物Y_(1-x)Gd_xBaCo_2O_5中稀土离子半径对电荷有序转变的影响  

EFFECT OF RARE EARTH IONIC RADIUS ON CHARGE ORDERING IN Y_(1-x)Gd_xBaCo_2O_5 LAYERED PEROVSKITE

作　　者：吴娜[1] 张蕾[1] 郗传英[1] 方军[1] 

机构地区：[1]中国科学院强磁场科学中心,合肥230031

出　　处：《低温物理学报》2012年第5期391-394,共4页Low Temperature Physical Letters

摘　　要：研究了层状钙钛矿钴氧化物Y1-xGdxBaCo2O5(x=0,0.25,0.5,0.75,1)的结构和输运性质,结果显示它们具有相似的相变行为,从而证明GdBaCo2O5与YBaCo2O5一样,也存在电荷有序转变.结果还表明电荷有序转变温度随稀土离子半径增加而上升.The structural and transport properties of the layered cobalt oxide Yl-xGdxBaCo20s （x= 0,0. 25,0. 5, 0. 75,1） were investigated. From the evolution of the behavior between YBaCo2O5 and GdBaCo2O5 we have confirmed the existence of charge-ordering transition in GdBaCo2O5. It is also shown that the charge-ordering transition temperature rises with increasing the ionic radius o{ rare earth.

关 键 词：层状钙钛矿 钴氧化物 电荷有序 

分 类 号：O482.5[理学—固体物理]