Effects of the surface layer of La2/3Ca1/3MnO3 thin films |
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Authors: | Zhiyuan Yao Yimin Cui Zhaoqiang Shen |
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Institution: | a Physics Department, Laboratory of Advanced Materials, Tsinghua University, Beijing 100084, People’s Republic of China b Physics Department, School of Science, Beijing University of Aeronautics and Astronautics, Beijing 100083, People’s Republic of China |
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Abstract: | The surface layer effects on transport in epitaxial La2/3Ca1/3MnO3 thin films are studied. It was found that the two-probe resistance is nonlinear which is enhanced with decreasing temperature. Similar to the resistance of intrinsic La2/3Ca1/3MnO3 thin films reported in the literature, the apparent dynamic contact resistance behaves semiconducting at high temperatures, passes through a peak, and displays a metallic behavior. At lowest temperatures, the curve of the contact resistance versus temperature shows a little upturn. The temperature dependent work function difference between the surface layer and the thin film underneath, together with the tunneling process across either the resulting charge depleted layer or the semiconducting surface layer is used to explain our observations. |
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Keywords: | 68 35 -p 73 40 Cg 75 47 Gk |
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