| Magnetic-Field-Induced Semimetal-Insulator-like Transition in Highly Oriented Pyrolitic Graphite |
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| 作者姓名： | 王志明 邢定钰 张世远 徐庆宇 Margriet VanBael 都有为 |
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| 作者单位： | [1]Institute of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094 [2]National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 [3]Universitat Leipzig, Fakultat für Physik und Geowissenschaften, Institut ff/r Experimentelle Physik Ⅱ, Linnéstrasse 5, D-04103 Leipzig, Germany [4]Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium |
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| 基金项目： | Supported by National Laboratory of Solid State Microstructures of Nanjing University （LSSMS） under Grant No M041901 and the Belgian Fund for Scientific Research Flanders （FW0）. We are grateful to Professor Wang Mu for the H0PG sample, AFM equipment and Professor Peter Lievens for helpful discussions. |
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| 摘 要： | We report the extraordinarily large positive magnetoresistances （MR, 69400% at 4.5K under a magnetic field of 8.15 T）, de Hass-van Alphen oscillations effect at 10 K and the semimetal-Jnsulator-like transition in a wide range of temperature in highly oriented pyrolitic graphite （HOPG）. Besides a dominating ordinary MR （OMR） mechanism in the free-electron mode, it is realized from qualitative analysis that the Coulomb interacting quasiparticles within graphite layers play some roles. However it is difficult to associate the transition with the simple OMR theory. In order to investigate the possible origins of the transition, further analysis is carried out. It is revealed that the magnetic-field-induced behaviour is responsible for the semimetal-insulator-like transitions in HOPG.
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| 关 键 词： | 磁性 感应 半金属 绝缘体 |
| 修稿时间： | 2006-09-28 |
Magnetic-Field-Induced Semimetal-Insulator-like Transition in Highly Oriented Pyrolitic Graphite |
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| WANG Zhi-Ming,XING Ding-Yu,ZHANG Shi-Yuan,XU Qing-Yu,Margriet VanBael,DU You-Wei.Magnetic-Field-Induced Semimetal-Insulator-like Transition in Highly Oriented Pyrolitic Graphite[J].Chinese Physics Letters,2007,24(1):199-202. |
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| Authors: | WANG Zhi-Ming XING Ding-Yu ZHANG Shi-Yuan XU Qing-Yu Margriet VanBael DU You-Wei |
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| Institution: | Institute of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
Universität Leipzig, Fakultät für Physik und Geowissenschaften, Institut für Experimentelle Physik II, Linnéstrasse 5, D-04103 Leipzig, Germany
Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium |
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| Abstract: | We report the extraordinarily large positive magnetoresistances (MR, 69400% at 4.5K under a magnetic field of 8.15T), de Hass--van Alphen oscillations effect at 10K and the semimetal-insulator-like transition in a wide range of temperature in highly oriented pyrolitic graphite (HOPG). Besides a dominating ordinary MR (OMR) mechanism in the free-electron mode, it is realized from qualitative analysis that the Coulomb interacting quasiparticles within graphite layers play some roles. However it is difficult to associate the transition with thesimple OMR theory. In order to investigate the possible origins of the transition, further analysis is carried out. It is revealed that the magnetic-field-induced behaviour is responsible for the semimetal-insulator-like transitions in HOPG. |
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| Keywords: | 73 50 Jt 71 30 +h 72 15 Gd |
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