Landau level quantization and possible superconducting instabilities in highly oriented pyrolitic graphite

Abstract
Measurements of the basal-plane resistivity ρa(T,H) performed on highly oriented pyrolitic graphite, with magnetic field Hc-axis in the temperature interval 2–300K 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.