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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.