La_(0.7)Pb_(0.3)MnO_3薄膜的溶胶凝胶法制备及电特性研究  

Fabrication and Electric Properties of La_(0.7)Pb_(0.3)MnO_3 Thin Film by Sol-gel Method

作　　者：朱金山[1] 韩建设[1] 朱敏[1] 

机构地区：[1]西安科技大学理学院,西安710054

出　　处：《渭南师范学院学报》2010年第5期38-40,共3页Journal of Weinan Normal University

基　　金：陕西省自然科学基金资助项目(ZK2007F46)

摘　　要：利用溶胶凝胶法在单晶LaAlO3(100)衬底上成功的制备了La0.7Pb0.3MnO3外延膜.用X射线衍射仪、直流四探针法对其结构及电特性进行了研究.结果表明,薄膜为赝立方钙钛矿结构,晶胞参数为a=3.907nm.电阻率随着温度的增加,从金属导电行为向半导体行为转变,转变温度为TP=336K,利用双交换理论对此现象作了合理的解释.其电阻率在低温区时满足ρ=ρ0+ρ1T2+ρ2T4.5,其导电机制主要是电子与电子的散射,在T>TMI时主要是小极化子输运.Using sol-gel method,La0.7Pb0.3MnO3 thin films have been epitaxially grown on（100） LaAlO3 substrates.The thin film was characterized by X ray diffraction,direct current four-probe method.The results show that the thin film has a pseudo-cubic perovskite structure with the cell parameter a=3.907nm.There is a transition from the metal to insulator with the increment of the temperature;a reasonable explanation is given by double interaction theory.The transition temperature is 336K.The transport results show that the data is satisfied with ρ=ρ0 ＋ρ1T2＋ρ2T4.5 in the rang of TTP,the metal conductivity mechanism is electron versus electron scatting,and the insulator conductivity mechanism is small polaron.

关 键 词：薄膜 La0.7Pb0.3MnO3 溶胶凝胶法 电输运特性 

分 类 号：O482[理学—固体物理]