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La2/3Ca1/3MnO3薄膜的光致电阻率变化特性

The change of photo-induced resistivity properties in La2/3Ca1/3MnO3 thin films

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【作者】 汪世林陈长乐王跃龙金克新王永仓任韧宋宙模袁孝

【Author】 Wang Shi-Lin 1) Chen Chang-Le 1) Wang Yue-Long 1) Jin Ke-Xin 1) Wang Yong-Cang 1) Ren Ren 1)2) Song Zhou-Mo 1) Yuan Xiao 3) 1)(Department of Applied Physics,Northwestern Polytechnical University, Xi’an 710072, China) 2)(Science School,Xi’an Jiaotong University, Xi’an 710049, China) 3)(Huazhong University of Science and Technology,Wuhan 430074,China)

【机构】 西北工业大学应用物理系华中科技大学 西安710072西安710072西安710072西安交通大学理学院西安710049武汉430074

【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≈ 30 8K(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(T <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=4 3 5 % ;当T>Tc 时 ,ΔR R <0 ,即光电导效应 .调制激光脉冲光响应实验发现 ,光致信号强度和温度及偏置电流之间存在非线性关系 :光致电阻率增大信号极大值为偏置电流的二次函数 ,而极大值对应的温度和偏置电流成线性关系 ,同时 ,光响应有一个截止温度 ,并且存在最佳光响应偏置电流和温度条件 .分析认为LCMO薄膜的光致电阻率变化特性和材料的eg↓自旋电子的状态以及与此相应的小极化子的形成有关

【Abstract】 Photo-induced resistivity change p has been studied in perovskite manganite La 2/3Ca 1/3MnO 3 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 e g↓ carriers and polarons.

【基金】 国家自然科学基金 (批准号 :60 1710 43 );陕西省自然科学基金 (批准号 :2 0 0 1C2 1)资助的课题~~
  • 【文献出处】 物理学报 ,Acta Physica Sinica , 编辑部邮箱 ,2004年02期
  • 【分类号】O484.4
  • 【被引频次】29
  • 【下载频次】173
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