Studies of High Temperature Superconductors 45, 59 (2003) ed. A. Narlikar

Y. Kopelevich, P. Esquinazi, J. H. S. Torres, R. R. da Silva, H. Kempa, F. Mrowka, R. Ocana

Abstract

This article reviews recent results of magnetotransport and magnetization measurements performed on highly oriented pyrolitic graphite (HOPG) and single crystalline Kish graphite samples. Both metal-insulator and insulator-metal transitions driven by magnetic field applied perpendicular to the basal planes of graphite were found and discussed in the light of relevant theories. The results provide evidence for the existence of localized superconducting domains in HOPG even at room temperature, as well as an interplay between superconducting and ferromagnetic correlations. We also present experimental evidence for the superconductivity occurrence in graphite-sulfur composites.