Magnetothermal Transport of Oriented Graphite at Low Temperatures
Abstract
We have studied the magnetic field dependence of the thermal conductivity (T,B) of highly oriented pyrolytic graphite samples at temperatures 0.2K T < 10K and fields 0T B 9T. The samples show clear deviations from the Wiedemann-Franz law with a kink behavior at fields B 0.1 T near the metal-insulator transition observed in electrical resistivity measurements. We further show that the oscillations in the thermal conductivity at the quantum limit B > 1 T, which are correlated with the Landau quantization observed in Hall measurements, increase in amplitude with temperature following a T3 law at T > 0.2 K and show a maximum at T 6 K, suggesting that they are phonons mediated.
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