Magnetic-Field-Induced Semimetal-Insulator-like Transition in Highly Oriented Pyrolitic Graphite  

作　　者：王志明 邢定钰 张世远 徐庆宇 Margriet VanBael 都有为 

机构地区：[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

出　　处：《Chinese Physics Letters》2007年第1期199-202,共4页中国物理快报（英文版）

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.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.

分 类 号：O44[理学—电磁学]