【作者】 张芹； 饶光辉； 肖荫果； 董汇泽； 刘广耀； 张毅； 陈景然；

【Author】 Q.Zhang, G.H.Rao Y.G.Xiao, H.Z.Dong, G.Y.Liu, Y.Zhang, J.R.Chen, Institute of Physics, Chinese Academy of Science, P.O.box 603, Beijing 100080,China

【机构】 中国科学院物理研究所A03组；

【摘要】 本文系统研究了V替代Fe对Sr2FeMoO6的晶体结构和电磁特性的影响。结构精修表明V的掺入降低了B位有序度;电测量结果显示,Sr2FeMoO6及低掺杂量的样品呈半导体性,V含量较高的样品在低温呈半导体特性,而在高温呈金属性;样品的居里温度和磁阻效应随掺杂量的提高也有所降低。更多还原

【Abstract】 We have investigated the crystal structure, transport and magnetice properties of a series of double-perovskite compound Sr2(Fe1-xVx)MoO6(0≤x≤0.1). The degree of ordering decreases with the increasement of doping level. Risistance measurement show that these compounds exhibit a metal-insulator transition as a function of doping x, the samples for x=0, x=0.03 and x=0.05 show semiconductive behavior, while the other two samples for x=0.08 and x=0.1 exhibit a semiconductor-metal transition. Its transitin temperature (Tc) and magnetroresistance (MR) decrease gradually with increasing x due to the reduced crystallographic ordering.更多还原