Magnetic-Field-Induced Semimetal-Insulator-like Transition in Highly Oriented Pyrolitic Graphite
WANG Zhi-Ming1,2, XING Ding-Yu2, ZHANG Shi-Yuan2, XU Qing-Yu3, Margriet VanBael4, DU You-Wei2
1Institute of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094
2National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
3Universität Leipzig, Fakultät für Physik und Geowissenschaften, Institut für Experimentelle Physik II, Linnéstrasse 5, D-04103 Leipzig, Germany
4Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium
Magnetic-Field-Induced Semimetal-Insulator-like Transition in Highly Oriented Pyrolitic Graphite
WANG Zhi-Ming1,2;XING Ding-Yu2;ZHANG Shi-Yuan2;XU Qing-Yu3;Margriet VanBael4;DU You-Wei2
1Institute of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094
2National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093
3Universität Leipzig, Fakultät für Physik und Geowissenschaften, Institut für Experimentelle Physik II, Linnéstrasse 5, D-04103 Leipzig, Germany
4Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium
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.
2007, Vol. 24 
