Field-induced metal-insulator Field-induced metal-insulator transition   in the c-axis resistivity of graphite
  We show that the resistivity perpendicular $\rho_c$ and parallel $\rho_a$ 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 $\rho_a$ of graphite and indicate that the metallic-like temperature dependence of $\rho_c$ is directly correlated to that of $\rho_a$. 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. 
H. Kempa, P. Esquinazi and Y. Kopelevich