欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
用溶胶-凝胶法在LaAlO3衬底上制备了La0．7Ca0．3MnO3薄膜，研究了La0．7Ca0．3MnO3薄膜的结构和输运特性．结果表明：La0．7Ca0．3MnO3薄膜呈现畸变钙钛矿结构，具有好的外延性；在同一温度下，电阻在磁场作用下变小，在283K和88K分别出现了金属-绝缘体转变，产生了双极值现象，并且在双极值附近电阻变化最大；用连续激光作用薄膜时，同样出现了双极值现象，在同一温度下，电阻反而变大，在升温和降温过程中出现了明显的滞后行为．根据双交换和小极化子理论，这些现象与Mn离子的eg电子受激跃迁有关．
英文摘要：
La0.7Ca0.3MnO3 thin film with colossal magnetoresistance was fabricated by sol-gel method on the LaAlO3 substrate. The structure and transport properties are investigated. It is found that the thin film show distorted perovskite-type crystal structure and fine epitaxy. While induced by the magnetic or photo field, there are the insulator-metal transition and double extreme value. At the same temperature, the resistivity decreas on the magnetic field, but increasing on the photo-field. When the thin film is irradiated by laser, The hysteretic behavior can be observed in the process of the increasing and decreasing temperature. According to the theory of double exchang effect and small-polaron, these phenomena arise from excited transition of cg electrons of Mn ions.
同期刊论文项目
同项目期刊论文
期刊信息
位置：