Mo低掺杂La_(0.67)Sr_(0.33)MnO_3的磁电特性及室温磁电阻增强(英文)  

MAGNETO-ELECTRIC PROPERTIES AND ENHANCED ROOM TEMPERATURE MAGNETORESISTANCE IN Mo-DOPIONG La_(0.67)Sr_(0.33)MnO_3

作　　者：陈亮[1] 鲁彦涛[1] 梅烨[1] 曹永珍[1] 刘宝琴[1] 何军辉[1] 

机构地区：[1]扬州大学物理科学与技术学院,扬州225002

出　　处：《低温物理学报》2009年第1期54-59,共6页Low Temperature Physical Letters

摘　　要：采用固相反应法成功制备了Mo低掺杂La0.67Sr0.33Mn1-xMoxO3(x=0,0.02)单相多晶样品,系统研究了样品的磁性、电输运特性和磁电阻效应.发现Mo低掺杂对La0.67Sr0.33MnO3的居里温度影响很小,但在La0.67Sr0.33MnO3铁磁基态背景下诱导出团簇自旋玻璃态行为.在低温区(0.1<T/Tc<0.5),电阻率随温度以ρ=ρ0+ρnTn(2<n<2.5)规律变化,并存在更低温下零场电阻率极小值.外加磁场(H=1.5T)可有效抑制电阻率反转,同时使电阻率极小值向低温方向移动.此外,Mo掺杂使室温下的磁电阻得到明显增强.Light Mo doping La0.67Sr0.33 Mn1-xMoxO3 （x =0. 0.02） system has been prepared successfully. The magnetic, transport properties and magnetoresistance have been systematically investigated. It was found that the Curie temperature Te decreases little with Mo doping, however, a cluster spin glass like behavior was induced by Mo doping in the ferromagnetic state of La0. 67 Sr0. 33 MnO3. In the low temperature range （0.1 〈 （T/Tc） 〈 0.5 ）, the electrical resistivity is found to follow an equation p = Po ＋ PnT^n （2 〈 n 〈 2. 5 ）. The samples clearly exhibit the zero field resistivity minimum and is suppressed by applied magnetic field （H = 1.5T）. The temperature corresponding to the resistivity minimum decreases considerably in presence of the applied magnetic field. Moreover, the slight Mo doping is found to result in the enhancement of room temperature magnetoresistance.

关 键 词：钙钛矿锰氧化物 Mo掺杂 磁电特性 室温磁电阻 

分 类 号：O482.5[理学—固体物理]