Possible Fractional Quantum Hall Effect in Graphite
Kopelevich, Y. · Raquet, B. · Goiran, M. · Escoffier, W. · da Silva, R. R. · Pantoja, J. C. Medina · Lukyanchuk, I. A. · Sinchenko, A. · Monceau, P.
Original · EN
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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