Abstract
The Fermi level of pyrolytic carbons is displaced through boron doping and intercalation and de-intercalation of sodium. Diamagnetic anisotropy and Hall effect measurements show that, whatever the initial doping level, the intercalation of sodium proceeds until the Fermi level is raised about 3 eV above the Brillouin zone corner. The average ionization of sodium atoms is estimated at 0.2−0.4 electronic charge. As theoretically predicted the diamagnetic anisotropy is maximum when the Fermi level is at the Brillouin zone corner.
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