【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.更多还原

【Abstract】 Light Mo doping La0.67Sr0.33Mn1-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 Tc decreases little with Mo doping, however, a cluster spin glass like behavior was induced by Mo doping in the ferromagnetic state of La0.67Sr0.33MnO3. In the low temperature range (0.1<(T/Tc)<0.5), the electrical resistivity is found to follow an equation ρ=ρ0+ρnTn(2<n<2.5). The samples clearly exhibit the zero field resistivity minimum and is suppressed by applied magnetic field (H=1.5 T). 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.更多还原