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La2/3Ca1/3MnO3薄膜的光致电阻率变化特性
引用本文:汪世林,陈长乐,王跃龙,金克新,王永仓,任 韧,宋宙模,袁 孝.La2/3Ca1/3MnO3薄膜的光致电阻率变化特性[J].物理学报,2004,53(2):587-591.
作者姓名:汪世林  陈长乐  王跃龙  金克新  王永仓  任 韧  宋宙模  袁 孝
作者单位:(1)华中科技大学,武汉 430074; (2)西北工业大学应用物理系,西安 710072; (3)西北工业大学应用物理系,西安 710072;西安交通大学理学院,西安 710049
基金项目:国家自然科学基金(批准号:60171043)和陕西省自然科学基金(批准号:2001C21)资助的课题.
摘    要:射频磁控溅射法制备了La2/3Ca1/3MnO3纳米薄膜(LCMO).该薄膜发生FM-PM相变的转变点温度为Tc≈308K(近似为电阻峰值温度Tp);在不同温度下的光电导性质实验表明所制备的LCMO薄膜在连续激光作用时低温段(Tc)表现为光致电阻率增大效应,即ΔR/R>0,并在R-T曲线拐点附近取得极大值,(ΔR/R)max=43.5%;当T>T关键词: 钙钛矿薄膜 光响应 电子自旋 小极化子

关 键 词:钙钛矿薄膜  光响应  电子自旋  小极化子
收稿时间:2003-04-15

The change of photo-induced resistivity properties in La2/3Ca1/3MnO3 thin films
Wang Shi-Lin,Chen Chang-Le,Wang Yue-Long,Jin Ke-Xin,Wang Yong-Cang,Ren Ren,Song Zhou-Mo and Yuan Xiao.The change of photo-induced resistivity properties in La2/3Ca1/3MnO3 thin films[J].Acta Physica Sinica,2004,53(2):587-591.
Authors:Wang Shi-Lin  Chen Chang-Le  Wang Yue-Long  Jin Ke-Xin  Wang Yong-Cang  Ren Ren  Song Zhou-Mo and Yuan Xiao
Abstract:Photo-induced resistivity change p has been studied in perovskite manganite La2/3Ca1/3MnO3 thin films with a continous wave laser and modulated laser pulses in this paper. Experimental results show that in the sample films, the maximum of photo-induced resistivity change(ΔR/R)max can reach 43.5%,which is a very exciting figure in this research field. Modulated laser pulse induced signal intensity has a highly nonlinear relation with the applied current and temperature. The maximum of photo-induced resistivity increase is a second power function of the applied current, while the temperature at which the maximum appears is proportional to the bias current. There exist an optimal bias current and a temperature for optical response in this film. These results are attributed to the optical excited eg↓ carriers and polarons.
Keywords:perovskite thin film  photoinduced  electron spin  small polaron
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