Abstract
We report on the investigation of magnetic field induced charge density waves and Hallcoefficient sign reversal in a quasi-two-dimensional electronic system of highly orientedpyrolytic graphite under very strong magnetic field. The change of Hall sign coefficientfrom negative to positive occurs at low temperature and high magnetic field just after thecharge density wave transition, suggesting the role of hole-like quasi-particles inthis effect. Angular dependent measurements show that the charge density wavetransition and Hall sign reversal fields follow the magnetic field component along thec-axis of graphite.
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