Anomalous galvanomagnetic properties of graphite in the quantum limit

✍ Scribed by Ko Sugihara

• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 493 KB
• Volume: 17
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(79)90080-0

✦ Synopsis

Recent experiments on the galvanomagnetic effects of graphite in the quantum limit revealed that (l), uXYH is not a constant but depends on the field strength; (2), the resistivity p = 0;' at low temperatures has a field dependence of p = H/(A t BH"), n = I; and (3), the p vs T curve has a maximum at about T = 25 K. These results cannot be explained by a simple theory. However, in consideration of the appearance of the bound states Do and A" in the quantum limit we can provide a qualitative explanation of the above observed results, where D correspond to donor and A represents acceptor. In the quantum limit the possibility of the transitions D+ t (-e)+ Do and A-+(+ e)+A" is pointed out. Co-existence of the ionized impurity scattering and the neutral impurity scattering explains the qualitative features of the (H, T)-dependence of the resistivity at low temperatures. At high temperatures it is necessary to consider the phonon scattering and the carrier-carrier scattering. Without the carrier-carrier scattering the (H, T)-dependence of p at T > 25 K cannot be explained.