Phys. Rev. B 68, 165408 (2003) [6 pages]Magnetothermal conductivity of highly oriented pyrolytic graphite in the quantum limitReceived 14 May 2003; published 20 October 2003 We report on the magnetic field (0T<~B<~9T) dependence of the longitudinal thermal conductivity κ(T,B) of highly oriented pyrolytic graphite in the temperature range 5K<~T<~20K for fields parallel to the c axis. We show that κ(T,B) shows large oscillations in the high-field region (B>2T) 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.165408
DOI:
10.1103/PhysRevB.68.165408
PACS:
72.20.My, 72.15.Eb, 73.43.-f
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