Unconventional Magnetotransport in Graphite
Abstract
It has recently been found that when high quality (highly-oriented pyrolitic) graphite is placed in a magnetic field directed along the c-axis and the temperature is lowered, the resistance increases as it does in an insulator but then saturates. At lower temperatures and stronger fields, the resistivity begins to decrease again into what appears to be a ``re-entrant metallic state''. Using magnetotransport and Hall measurements, we show that this unusual behavior can be explained within a conventional multi-band model that takes into account the combination of unique features specific to semimetals, i.e., low carrier density, high purity, and an equal number of electrons and holes (compensation). More exotic explanations, such as a magnetic-field-induced excitonic insulator and superconductor, suggested earlier, are not necessary to describe the complete set of observations.Keywords
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