Benoît Fauqué, David LeBoeuf, Baptiste Vignolle, Marc Nardone, Cyril Proust, Kamran Behnia
A strong magnetic field applied perpendicular to the conducting layers of graphite induces an order believed to be a Charge Density Wave (CDW). Previous studies found that the ordered state is restricted to a field window between 25 T and 53 T. By extending magnetoresistance measurements for the first time up to 80 T, we find that this picture is to be substantially revised. Two successive phase transitions, consisting of two distinct ordered states each restricted to a finite field window, are induced by magnetic field. In both states, an energy gap opens up in the out-of-plane conductivity and coexists with an unexpected in-plane metallicity. Such a dichotomy in charge transport contrasts with what is documented in the case of conventional CDW systems. We argue that it may arise as a consequence of edge-state transport in presence of a bulk gap.
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http://arxiv.org/abs/1303.4074
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