锰位铁掺杂La_0·67Sr0·33FexMn1-xO3薄膜的光诱导效应  

Photo-induced effect of Mn site Fe doping in La_(0.67)Sr_(0.33)Fe_xMn_(1-x)O_3 thin films

作　　者：唐晶[1] 陈长乐[1] 金克新[1] 赵省贵[1] 

机构地区：[1]西北工业大学凝聚态结构与性质陕西省重点实验室,西安710072

出　　处：《物理学报》2008年第2期1166-1170,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50331040;60171034;50702046)资助的课题.~~

摘　　要：分别采用溶胶-凝胶法和脉冲激光沉积的方法制备了La0·67Sr0·33FexMn1-xO3(x=0,0·05,0·10,0·15)系列块材和薄膜,研究了Fe部分替代对La0·67Sr0·33FexMn1-xO3薄膜输运和光诱导特性的影响.研究表明,随着Fe含量的增加,薄膜的峰值转变温度下降,导电性降低.在激光作用下,薄膜在T<TP时表现为光致电阻率增大,而在高温段(T>TP)则减小,随着Fe掺杂量的增加,光致电阻相对变化极值增加,当x=0·15时,光致电阻变化率极大值达到38%.并从晶格效应的角度讨论了光诱导薄膜电阻率变化的内在机理.The compounds and films of La0·67Sr0·33FexMn1-xO3（x = 0, 0.05, 0.10,0.15） were prepared by the sol-gel technique and pulsed laser deposition method, respectively. The effect of Fe doping on the transport and photo-induced properties of La0·67Sr0·33FexMn1-xO3 film was investigated. Experimental results indicate that the Fe doping lowers the insulator-metal transition temperature, but increases the resistance. The photo-induced relative change in resistance increases initially with increasing temperature, then followed by a decrease. The maximum value of the relative change in resistance increases with increasing x, it reaching 38% when x = 0.15. The intriguing mechanism of photo-induced effect on the resistance was discussed in connection with lattice effect.

关 键 词：光诱导 FE掺杂 晶格效应 

分 类 号：O484[理学—固体物理]