Electronic Conductivity Upturn of HOPG Contrast to Transport Properties of Polycrystal Graphite

Details Electronic Conductivity Upturn of HOPG Contrast to Transport Properties of Polycrystal Graphite Electronic Conductivity Upturn of HOPG Contrast to Transport Properties of Polycrystal Graphite

2008-01-22

arxiv.org/abs/0801.3298v1

Physics

Condensed Matter

Materials Science

11 pages 5 figures

Scientific paper

The transport properties of highly oriented pyrolitic graphite (HOPG) and polycrystal graphite have been studied. The electric conductivity of HOPG is several times larger than that of the polycrystal graphite. Along with the large magnetoresistances (MR), the polycrystal graphite show the accordant semiconductor-like character in a wide temperature (roughly range from 20K to 120K) under 0, 4, 8, 12 T applied magnetic field, while the magnetic-field-induced metal-semiconductor-like transition was only found in HOPG. The difference of transport properties originates from the Coulomb interaction quasipartical in HOPG graphite layers in contrast with the grain boundary scattering in the polycrystal graphite.

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