| Intergranular Tunnelling and Field-Induced Percolation Fluctuation of Granular Composites （La1-zAgzMnO3）/（MnO2/Mn2O3） |
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| 作者姓名： | 张宁 包建春 李刚 耿滔 陈继康 |
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| 作者单位： | [1]Department of Physics, Nanjing Normal University, Nanjing 210097 [2]Department of Chemistry, Nanjing Normal University, Nanjing 210097 [3]Center of Measurement and Analysis, Nanjing Normal University, Nanjing 210097 [4]Department of Physics, University of Shanghai for Science and Technology, Shanghai 200000 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant No 20473038. |
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| 摘 要： | We investigate the giant magnetoresistance of composites （La1-xAgzMnO3）1-υ（MnO2/Mn2O3）υ. The magnetoresistive property of the composites shows the characteristics of intergranular tunnelling. A conductivity leap has been observed around y = 0.7. The composite （La0.926Ag0.074MnO3）0.698（MnO2/Mn2O3）0.302 has been found to show the greatest magnetoresistance in the samples. Its room-temperature MR ratio reaches 24% under a field of 1.8T. These phenomena suggest a percolation transformation and a kind of field-induced fluctuation in percolation in the samples investigated.
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| 关 键 词： | 磁致电阻 （La1-xAgzMnO3）1-υ（MnO2/Mn2O3）υ 隧道效应 场感应 |
| 收稿时间： | 2005-06-22 |
| 修稿时间： | 2005-06-22 |
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