Magnetothermal Transport of Oriented Graphite at Low Temperatures

Abstract

We have studied the magnetic field dependence of the thermal conductivity $\kappa (T,B)$ of highly oriented pyrolytic graphite samples at temperatures 0.2K$\le T<10$K and fields 0T$\le B\le 9$T. The samples show clear deviations from the Wiedemann-Franz law with a kink behavior at fields $B\sim 0.1$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 $\sim T^3$ law at $T>0.2$K and show a maximum at $T\sim 6$K, suggesting that they are phonons mediated.

5 figures, To be published in Journal of Low Temperature Physics, Volume 137 3/4, November 2004

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• Magnetic oscillations in planar systems with the Dirac-like spectrum of quasiparticle excitations II: transport properties
• Magnetotransport and thermoelectricity in disordered graphene
• Integer Quantum Hall Effect in Graphite
• Electron-phonon scattering at the intersection of two Landau levels
• Non-perturbative Euler-Heisenberg Lagrangian and Paraelectricity in Magnetized Massless QED