Metal-insulator transition in graphite: A comparison to heterostructures with high carrier mobility

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Erscheinungsjahr:
2008
Medientyp:
Text
Schlagworte:
  • Graphite
  • Magnetic fields
  • Density wave
  • Polyacrylonitriles
  • Carbon Fibers
  • Carbonization
  • Graphite
  • Magnetic fields
  • Density wave
  • Polyacrylonitriles
  • Carbon Fibers
  • Carbonization
Beschreibung:
  • Conditions for a transition from the insulator (I) to metal (M) state in the electron system of highly oriented pyrolytic graphite (HOPG) have been studied by means of magnetotransport measurements in a broad temperature range (0.3-150 K). In magnetic fields below a certain critical value (B <B c ≈ 0.05 T), HOPG exhibits the classical magnetoresistance, while for B > B c, the temperature dependence of the resistance is determined by the state (insulator versus metal) of the electron system. The M-I transition in HOPG, by analogy with that in heterostructures with two-dimensional electron gas, obeys the power law T c ∞ (B - B c) k (k = 0.25) and is related to the spin-orbit interaction of electron waves. © 2008 Pleiades Publishing, Ltd.
Lizenz:
  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH
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oai:www.edit.fis.uni-hamburg.de:publications/577d364f-2fbe-4a68-b72d-af6b869a56b6