Landau Level Quantization and Possible Superconducting Instabilities in   Highly Oriented Pyrolitic Graphite
  Measurements of the basal-plane resistivity rho_a(T,H) performed on highly oriented pyrolitic graphite, with magnetic field H parallel to the c-axis in the temperature interval 2 - 300 K and fields up to 8 T, provide evidence for the occurrence of both field - induced and zero-field superconducting instabilities. Additionally, magnetization M(T,H) measurements suggest the occurrence of Fermi surface instabilities which compete with the superconducting correlations. 
Y. Kopelevich, V. V. Lemanov, S. Moehlecke, and J. H. S. Torres