| 单晶石墨、多晶石墨电导行为的差异 |
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| 引用本文： | 王志明,徐庆宇,张世远,邢定钰,都有为.单晶石墨、多晶石墨电导行为的差异[J].物理学报,2007,56(6):3464-3467. |
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| 作者姓名： | 王志明 徐庆宇 张世远 邢定钰 都有为 |
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| 作者单位： | (1)德国莱比锡大学物理系，莱比锡 D-04103，德国; (2)南京大学固体微结构国家重点实验室，南京 210093; (3)南京理工大学机械工程学院，南京 210094；南京大学固体微结构国家重点实验室，南京 210093 |
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| 摘 要： | 报道了单晶石墨、多晶石墨电导行为的差异.在8.15T磁场下，4.5K处单、多晶石墨的正磁电阻效应分别为69400%，170%，同时在0T，8T磁场作用下，多晶石墨的电导行为呈现类绝缘体型性质，但在单晶石墨中我们发现了与磁场相关的类半金属-绝缘体型转变，通过分析，我们认为：单、多晶石墨电导行为存在较大差异的原因可能来源于库仑相互作用在高定向热解石墨中变得不可忽视，而多晶石墨样品却存在晶界散射.
关键词：
半金属石墨
类半金属-绝缘体型转变
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| 关 键 词： | 半金属石墨 类半金属-绝缘体型转变 |
| 文章编号： | 1000-3290/2007/56(06)/3464-04 |
| 收稿时间： | 2006-10-12 |
| 修稿时间： | 2006-10-12 |
Difference in electric conduction of monocrystal and polycrystal graphite |
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| wang Zhi-Ming,Xu Qing-Yu,Zhang Shi-Yuan,Xing Ding-Yu,Du You-Wei.Difference in electric conduction of monocrystal and polycrystal graphite[J].Acta Physica Sinica,2007,56(6):3464-3467. |
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| Authors: | wang Zhi-Ming Xu Qing-Yu Zhang Shi-Yuan Xing Ding-Yu Du You-Wei |
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| Institution: | 1.Institute of Mechanical Engineering, Nanjing University of Science and Technology , Nanjing 210094, China; 2.National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China; 3 . Universitat Leipzig, Fakultat für Physik und Geowissenschaften, Institut für Experimentelle Physik 11, Linnestrasse 5, Leipzig D-04103, Germany |
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| Abstract: | In this paper, we report the difference in electric conduction of monocrystal and polycrystal graphite. Under a magnetic field of 8.15T, the positive magnetoresistance ratio of monocrystal and polycrystal graphite samples are found to be 69400%, 170% respectively at 4.5K. The polycrystal graphite presents accordingly the insulator-like character in a wide interval of temperature under 0 and 8T applied magnetic field, but the magnetic-field-correlated semimetal-insulator-like Transition has been reported for the monocrystal graphite (highly oriented pyrolitic graphite, HOPG). On analysis, it is revealed that large difference in electric conduction originates predominantly from the Coulomb interaction in HOPG graphite layers in contrast with the crystal interface scattering in the polycrystal graphite. |
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| Keywords: | semimetal graphite semimetal-insulator-like transition |
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