真空退火La0.7Sr0.3MnO3薄膜的光诱导特性

材料研究学报

2009, Vol. 23

Issue (4): 395-398

研究论文

本期目录 | 过刊浏览

真空退火La_0.7Sr_0.3MnO₃薄膜的光诱导特性

谭兴毅 ; 金克新; 赵省贵; 陈长乐

西北工业大学理学院陕西省凝聚态结构与性质重点实验室西安710072

The vacuum annealing effect on the photoinduced properties in La _0.7 Sr _0.3 MnO ₃ thin film

TAN Xingyi; JIN Kexin; ZHAO Shenggui; CHEN Changle

Shannxi Key Laboratory of Condensed Matter Structures and Properties; School of Science; Northwestern Polytechnical University; Xi'an 710072

引用本文:

谭兴毅金克新赵省贵陈长乐. 真空退火La_0.7Sr_0.3MnO₃薄膜的光诱导特性[J]. 材料研究学报, 2009, 23(4): 395-398.
. The vacuum annealing effect on the photoinduced properties in La _0.7 Sr _0.3 MnO ₃ thin film[J]. Chin J Mater Res, 2009, 23(4): 395-398.

全文: PDF(787 KB)

摘要:

用溶胶--凝胶(Sol--gel)法制备La _0.7 Sr _0.3 MnO ₃(LSMO)靶材, 用脉冲激光沉积(PLD)法在LaAlO ₃(012)基片上沉积出厚度约为187 nm的LSMO薄膜, 研究了真空退火对薄膜的输运和光诱导特性的影响. 结果表明, 薄膜的相变温度随着退火时间的增加而降低, 薄膜的电阻率升高. 在低温金属相光照使电阻率降低, 在高温绝缘相光照则使电阻率升高. 随着退火时间的增加, 光电导( ?ρ )先增大而后减小, 在真空条件下退火40 min的薄膜光电导( ?ρ )达到最大值为0.013 Ωcm. 根据双交换作用解释了薄膜光电导的变化规律.

关键词 ：无机非金属材料, 稀土掺杂锰氧化物, 氧空位, 双交换作用, 光诱导效应

Abstract：

La_0.7Sr_0.3MnO₃ (LSMO) target has been prepared by a Sol–gel method and the film of LSMO with the thickness of 187 nm has been deposited on a (012)–oriented LaAlO₃substrate using the pulsed laser deposition technique. The transport and photoinduced properties of the LSMO film at different annealing conditions have been investigated. The phase transition temperature decreases and the electrical resistivity of the film increases with increasing the annealing time. Photoinduced properties show that the laser induces the increases of the electrical resistivity in the metallic phase and the reduction in the insulation phase. The photoconduction (Δρ) increases, and then decreases with increasing the annealing time. It is found that there exists the max photoconduction about 0.013 Ωcm for the sample with the 40 minutes vacuum annealing, which is attributed to double exchange interaction.

Key words： inorganic non–metallic materials rare earth doped manganite oxygen vacancy double exchange interaction photoinduced effect

收稿日期: 2008-10-27

ZTFLH:

TB383

基金资助:

国家自然科学基金重点50331040和国家自然科学基金(青年)面上50702046项目资助.

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