| Structure and transport properties of （La1-x-yYy）2/3Cal/3MnO3 with La-site vacancies |
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| 引用本文： | 罗广圣 刘光华 李小怡 熊惟皓 吴小山. Structure and transport properties of （La1-x-yYy）2/3Cal/3MnO3 with La-site vacancies[J]. 中国有色金属学会会刊, 2007, 17(5): 992-995 |
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| 作者姓名： | 罗广圣 刘光华 李小怡 熊惟皓 吴小山 |
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| 作者单位： | [1]School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China [2]School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China [3]Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China |
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| 摘 要： | Several samples of manganese oxides La（1-x）2/3Cal/3MnO3 （V-LCMO） and （La0.7-xY0.3）2/3Cal/3MnO3 （x〈0.15） （V-LYCMO） with vacancies at La-site （La-vacancy） were prepared by solid-state reaction method. The X-ray diffraction（XRD） patterns refined by Rietveld confirm that these compounds exhibit single phase structure with orthorhombic symmetry （Pnma）. The lattice parameters, Mn-O bond length and Mn—O—Mn bond angle vary with La-vacancy concentration, as an indication of the occurrence of the local Jahn-Teller effect. The measurement result of V-LCMO compounds shows that the maximum magnetoresistance（MR） is about 220% at TIM=268 K and La-vacancy content x=0.04. For V-LYCMO compounds, there exists metal-insulator transition at about 50 K, and a very large MR （over 106%） is observed at the temperature ranging from 40 K to 50 K.
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| 关 键 词： | 结构运输工具 （La1-x-yYy）2/3Cal/3MnO3 晶格空位 合金 |
| 修稿时间： | 2007-01-17 |
Structure and transport properties of (La1-x-yYy)2/3Ca1/3MnO3 with La-site vacancies |
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| LUO Guang-sheng,LIU Guang-hua,LI Xiao-yi,XIONG Wei-hao,WU Xiao-shan. Structure and transport properties of (La1-x-yYy)2/3Ca1/3MnO3 with La-site vacancies[J]. Transactions of Nonferrous Metals Society of China, 2007, 17(5): 992-995 |
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| Authors: | LUO Guang-sheng LIU Guang-hua LI Xiao-yi XIONG Wei-hao WU Xiao-shan |
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| Affiliation: | 1. School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 2. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China; 3. Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China |
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| Abstract: | |
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| Keywords: | La(1-x)2/3Ca1/3MnO3 (La0.7-xY0.3)2/3Ca1/3MnO3 La-vacancy orthorhombic symmetry Jahn-Teller effect |
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