Magnetothermal Conductivity of Highly Oriented Pyrolytic Graphite in the Quantum Limit

Details Magnetothermal Conductivity of Highly Oriented Pyrolytic Graphite in the Quantum Limit Magnetothermal Conductivity of Highly Oriented Pyrolytic Graphite in the Quantum Limit

2003-09-05

arxiv.org/abs/cond-mat/0309129v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 Figures, to be published in Physical Review B (2003)

Scientific paper

10.1103/PhysRevB.68.165408

We report on the magnetic field (0T$ \le B \le 9$T) dependence of the longitudinal thermal conductivity $\kappa(T,B)$ of highly oriented pyrolytic graphite in the temperature range 5 K $\le T\le$ 20 K for fields parallel to the $c-$axis. We show that $\kappa(T,B)$ 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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