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

We show that the resistivities 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~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 metalliclike 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 inadequate to understand the transport properties of graphite.