La_(0.67)Ca_(0.33)Mn_(1-x)T_xO_3低场下的大磁阻效应  

Colossal Magnetoresistance Effect ofLa_(0.67)Ca_(0.33)Mn_(1-x)T_xO_3 under Low Magnetic Fields

作　　者：秦宏伟[1] 胡季帆[1] 赵文瑾[1] 

机构地区：[1]山东大学物理系,山东济南250100

出　　处：《稀土》2001年第1期55-57,共3页Chinese Rare Earths

基　　金：国家自然科学基金资助项目!(编号 5 9772 0 40 )

摘　　要：研究了在低磁场 H≤ 0 .8T区间下的材料 L a0 .6 7Ca0 .33Mn1 - x Tx O3( T=Fe或 Ni)中的磁阻效应 ,发现在L a0 .6 7Ca0 .33Mn1 - x Fex O3中用铁替代锰降低了磁阻比 ,但改善了磁阻随磁场变化的线性度。用少量的镍替换锰 ( x=0 .1)时 。In this work,the magnetoresistance of La 0 67 Ca 0 33 Mn 1-x T xO 3(T=Fe or Ni)has been investigated in the low magnetic field range H≤0 8T.It has been found that the replacement of Mn by Fe lowers the low field magnetoresistance,but improves the behavior of linearity of low field magnetoresistance.Meanwhile the better low field large magnetoresistance change can be observed in the low addition of Ni(x=0 1)

关 键 词：大磁阻材料 低磁场 锰基磁性材料 钙钛矿结构 大磁阻效应 

分 类 号：TM271[一般工业技术—材料科学与工程]