Searching for the Fractional Quantum Hall Effect in Graphite

Y. Kopelevich, B. Raquet, M. Goiran, W. Escoffier, R. R. da Silva, J. C. Medina Pantoja, I. A. Luk’yanchuk, A. Sinchenko, and P. Monceau
Phys. Rev. Lett. 103, 116802 – Published 9 September 2009

Abstract

Measurements of basal plane longitudinal ρb(B) and Hall ρH(B) resistivities were performed on highly oriented pyrolytic graphite samples in a pulsed magnetic field up to B=50T applied perpendicular to graphene planes, and temperatures 1.5KT4.2K. At B>30T and for all studied samples, we observed a sign change in ρH(B) from electron- to holelike. For our best quality sample, the measurements revealed the enhancement in ρb(B) for B>34T (T=1.8K), presumably associated with the field-driven charge density wave or Wigner crystallization transition. In addition, well-defined plateaus in ρH(B) were detected in the ultraquantum limit revealing possible signatures of the fractional quantum Hall effect in graphite.

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  • Received 12 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.116802

©2009 American Physical Society

Authors & Affiliations

Y. Kopelevich1, B. Raquet2,3, M. Goiran2,3, W. Escoffier2,3, R. R. da Silva1, J. C. Medina Pantoja1, I. A. Luk’yanchuk4, A. Sinchenko5,6, and P. Monceau6

  • 1Instituto de Física “Gleb Wataghin,“ Universidade Estadual de Campinas, UNICAMP 13083-970, Campinas, São Paulo, Brasil
  • 2CNRS; UPR 3228 LNCMI; 143 Avenue de Rangueil, F-31400 Toulouse, France
  • 3Université de Toulouse, UPS, INSA, LNCMI; F-31400 Toulouse, France
  • 4Laboratoire de Physique de Matière Condensée, Université de Picardie Jules Verne, Amiens, 80039, France
  • 5Moscow Engineering-Physics Institute, 115409, Moscow, Russia
  • 6Institut Néel, CNRS, B.P. 166, 38042 Grenoble cedex 9, France

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Issue

Vol. 103, Iss. 11 — 11 September 2009

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