La_(0.5)Sr_(0.5)MnO_3薄膜的输运特性和光诱导效应  

Transport properties and laser-indued effect of the La_(0.5)Sr_(0.5)MnO_3 film

作　　者：金克新[1] 陈长乐[1] 王永仓[1] 赵省贵[1] 任韧[2] 袁孝[3] 宋宙模[1] 

机构地区：[1]西北工业大学 [2]西安交通大学 [3]华中科技大学激光技术国家重点实验室

出　　处：《材料研究学报》2005年第2期185-188,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金60171034陕西省自然科学基金2001C21西工大博士生创新基金CX200323资助项目~~

摘　　要：用磁控溅射方法制备了La0.5Sr0.5MnO3薄膜,研究了薄膜的输运特性和光诱导效应. La0.5Sr0.5MnO3薄膜具有温度相变特征:低温为铁磁金属相,高温则为顺磁非导体相,相变温度420 K. 为铁磁金属相时,光诱导效应导致薄膜的电阻增大,在360 K电阻变化相对值的最大值约为9.62%.根据双交换作用模型,激光导致顺磁非导体相小极化子的浓度增加,使电阻减小.The phase transition from the metallic phase to the nonconductive phase occurred at 420 K in La0.5Sr0.5MnO3 thin film prepared by the magnetron sputtering method. The enhancement of the Curie temperature can be caused by the lattice mismatch between the thin film and the substrate. The laser-induced effect resulted in the resistance increase of the thin film in the metallic phase, and the maximum of the resistance relative change was about 9.62% at 360 K. These can be attributed to the double exchange effect and small polarons theory.

关 键 词：无机非金属材料 特大磁电阻效应 光诱导效应 双交换作用 小极化子理论 

分 类 号：TB383[一般工业技术—材料科学与工程] O482[理学—固体物理]