| La0.7Ca0.3MnO3薄膜的电学输运特性与膜厚之间关系的研究 |
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| 引用本文： | 步海军,高炬,胡古今,戴宁.La0.7Ca0.3MnO3薄膜的电学输运特性与膜厚之间关系的研究[J].红外与毫米波学报,2014,33(4):364-368. |
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| 作者姓名： | 步海军 高炬 胡古今 戴宁 |
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| 作者单位： | 1. 中国科学院上海技术物理研究所红外物理国家重点实验室,上海,200083
2. 香港大学物理系 香港 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目(批准号：2012CB934300)、国家自然科学基金(批准号：11074265, 11174307, 61290304)、中国科学院知识创新专项项目(批准号：Q-Zy-50)资助课题 |
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| 摘 要： | 利用溶胶-凝胶工艺在SrTiO3单晶衬底上制备了一系列不同厚度的La0.7Ca0.3MnO3薄膜.X射线衍射表明这些薄膜均具有高度的择优取向性和结晶学质量.电学输运性质的研究结果凸显了膜厚的重要作用,主要归因于衬底施加的应力引起的薄膜晶格参数的改变.进一步的分析揭示,在厚度较小的膜中,小极化子的变程跃迁是高温下La0.7Ca0.3MnO3薄膜的主要导电机制,而在较厚的膜中,即使在低温下小极化子也是主要的载流子.
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| 关 键 词： | 溶胶-凝胶 锰氧化物 膜厚 小极化子 变程跳跃 |
| 收稿时间： | 3/9/2013 12:00:00 AM |
| 修稿时间： | 2014/5/16 0:00:00 |
Dependence of transport property of sol-gel derived La0.7Ca0.3MnO3 thin films on their thicknesses |
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| BU Hai-Jun,GAO Ju,HU Gu-Jin and DAI Ning.Dependence of transport property of sol-gel derived La0.7Ca0.3MnO3 thin films on their thicknesses[J].Journal of Infrared and Millimeter Waves,2014,33(4):364-368. |
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| Authors: | BU Hai-Jun GAO Ju HU Gu-Jin and DAI Ning |
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| Affiliation: | National Laboratory for Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Science,Department of Physics,The University of Hong Kong,Hong Kong,National Laboratory for Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Science and National Laboratory for Infrared Physics,Shanghai Institute of Technical Physics,Chinese Academy of Science |
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| Abstract: | La0.7Ca0.3MnO3 thin films with various thicknesses were successfully fabricated on SrTiO3 single crystal substrates via sol-gel method. X-Ray diffraction manifests that all the films have highly preferential orientation. Electrical transport measurement shows a strong impact of film thickness on the physical properties of La0.7Ca0.3MnO3 thin films, which can be attributed to the change of lattice structure of the films substrate induced by strain. Further study indicates that in the films with small film thicknesses, variable range hopping of small polarons is the dominant transport process at high temperatures, and in those films with larger thicknesses small polarons are the predominant charge carriers even at very low temperatures. |
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| Keywords: | Sol-Gel manganite film thickness small polarons variable range hopping |
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