Dresden 2003 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 6: Postersitzung I (Amorphe- u. Tunnelsysteme, Niedrigdimensionale Systeme, Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter)
TT 6.10: Poster
Montag, 24. März 2003, 14:30–19:00, P2c, P2d
Reentrant Metallic Behavior of Graphite in the Quantum Limit — •Y. Kopelevich1, J.H.S. Torres1, R.R. da Silva1, F. Mrowka2, H. Kempa2, and P. Esquinazi2 — 1Instituto de Física, Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, São Paulo, Brasil — 2Abteilung Supraleitung und Magnetismus, Universität Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany
Magnetotransport measurements (longitudinal and transverse resistances) performed on several well-characterized highly oriented pyrolytic graphite (HOPG) and single crystalline Kish graphite samples reveal a reentrant metallic behavior in the basal-plane resistance in the quantum limit, when only the lowest Landau levels are occupied. The magnetic-field-induced transition suggests that the quantum Hall effect, Landau-level-quantization-induced superconducting correlations, and the magnetic catalysis may be relevant to understand the metallic-like state(s) in graphite in the quantum limit.