Two Phase Transitions Induced by a Magnetic Field in Graphite

Benoît Fauqué, David LeBoeuf, Baptiste Vignolle, Marc Nardone, Cyril Proust, and Kamran Behnia
Phys. Rev. Lett. 110, 266601 – Published 25 June 2013
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Abstract

Different instabilities have been speculated for a three-dimensional electron gas confined to its lowest Landau level. The phase transition induced in graphite by a strong magnetic field, and believed to be a charge density wave, is the only experimentally established case of such instabilities. Studying the magnetoresistance in graphite for the first time up to 80 T, we find that the magnetic field induces two successive phase transitions, consisting of two distinct ordered states each restricted to a finite field window. In both states, an energy gap opens up in the out-of-plane conductivity and coexists with an unexpected in-plane metallicity for a fully gap bulk system. Such peculiar metallicity may arise as a consequence of edge-state transport expected to develop in the presence of a bulk gap.

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  • Received 2 April 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.266601

© 2013 American Physical Society

Authors & Affiliations

Benoît Fauqué1,*, David LeBoeuf2, Baptiste Vignolle2, Marc Nardone2, Cyril Proust2, and Kamran Behnia1

  • 1LPEM (UPMC-CNRS), Ecole Supérieure de Physique et de Chimie Industrielles, 75005 Paris, France
  • 2Laboratoire National des Champs Magnétiques Intenses (CNRS-INSA-UJF-UPS), 31400 Toulouse, France

  • *benoit.fauque@espci.fr

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Issue

Vol. 110, Iss. 26 — 28 June 2013

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