Magnetothermal Conductivity of Highly Oriented Pyrolytic Graphite in the Quantum Limit
Abstract
We report on the magnetic field (0T B 9T) dependence of the longitudinal thermal conductivity (T,B) of highly oriented pyrolytic graphite in the temperature range 5 K T 20 K for fields parallel to the c-axis. We show that (T,B) shows large oscillations in the high-field region (B > 2 T) where clear signs of the Quantum-Hall effect are observed in the Hall resistance. With the measured longitudinal electrical resistivity we show that the Wiedemann-Franz law is violated in the high-field regime.
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