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Field-induced metal-insulator Field-induced metal-insulator transition in the c-axis resistivity of graphite

We show that the resistivity perpendicular $ρ_c$ and parallel $ρ_a$ to the basal planes of different graphite samples show similar magnetic-field-driven metal-insulator-transitions at a field $B_c \sim 0.1 T$ applied parallel to the c-axis. Our results demonstrate the universality of the recently found scaling in $ρ_a$ of graphite and indicate that the metallic-like temperature dependence of $ρ_c$ is directly correlated to that of $ρ_a$. The similar magnetoresistance found for both resistivities, the violation of Kohler's rule and the field-induced transition indicate that the semiclassical transport theory is inadecuate to understand the transport properties of graphite.