Possible Fractional Quantum Hall Effect in Graphite
Abstract
Measurements of basal plane longitudinal rhob(B) and Hall rhoH(B) resistivities were performed on highly oriented pyrolytic graphite (HOPG) samples in pulsed magnetic field up to B = 50 T applied perpendicular to graphene planes, and temperatures 1.5 K < T < 4.2 K. At B > 30 T and for all studied samples, we observed a sign change in rhoH(B) from electron- to hole-like. For our best quality sample, the measurements revealed the enhancement in rhob(B) for B > 34 T (T = 1.8 K), presumably associated with the field-driven charge density wave or Wigner crystallization transition. Besides, well defined plateaus in rhoH(B) were detected in the ultra-quantum limit revealing the signatures of fractional quantum Hall effect in graphite.
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