亚锰酸盐La_(0.7)Ca_xSr_(0.3-x)MnO_3的磁电阻效应  

MAGNETORESISTANCE EFFECTS OF MANGANITE La_(0.7)Ca_xSr_(0.3-x)MnO_3

作　　者：王晶[1] 

机构地区：[1]哈尔滨理工大学

出　　处：《哈尔滨师范大学自然科学学报》2003年第2期39-41,共3页Natural Science Journal of Harbin Normal University

基　　金：黑龙江省自然科学基金资助项目 (F 0 1-2 1)

摘　　要：研究了用固相反应法制备亚锰酸盐 L a0 .7Cax Sr0 .3- x Mn O3系列多晶样品 (量分数 x=0 .0 5 ,0 .1 0 ,0 .1 5 ,0 .2 0 ,0 .2 5 ,0 .30 ) ,并在零磁场和 0 .3T磁场下研究了电阻和磁电阻与温度 ( 77～ 380 K)的关系 ,结果发现随 x的增加 ,样品的巨磁电阻效应的峰值温度向高温移动 。The manganite polycrystalline samples La 0.7 Ca x Sr 0.3-x MnO 3( x =0,0.05,0.10,0.15,0.20,0.25,0.30) were prepared by the solid-state reaction technique. The electrical resistance( R ) and magneto resistance (M R ) have been measured in the temperature region form 77 K to 380 K in applied fields from zero to 0.3 T. The element substitution of Ce for La and the doping concentration dependence of R and M R were studied. It is found that the temperature of the peak of giant magneto resistance (GMR) increase. While the temperatures, at which the peak of M R appears, is equal basically.

关 键 词：亚锰酸盐 La0.7CaxSr0.3-xMnO3 磁电阻效应 铁磁性 磁超晶格 钙钛矿型锰氧化物 

分 类 号：O737[理学—晶体学]