Supermetallic conductivity in bromine-intercalated graphite

S. Tongay, J. Hwang, D. B. Tanner, H. K. Pal, D. Maslov, A. F. Hebard

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Abstract

Exposure of highly oriented pyrolytic graphite to bromine vapor gives rise to in-plane charge conductivities which increase monotonically with intercalation time toward values (for ∼6 at% Br) that are significantly higher than Cu at temperatures down to 5 K. Magnetotransport, optical reflectivity and magnetic susceptibility measurements confirm that the Br dopes the graphene sheets with holes while simultaneously increasing the interplanar separation. The high-room-temperature mobility (∼5× 104cm 2/V) and resistance anisotropy together with the reduced diamagnetic susceptibility of the intercalated samples suggests that the observed supermetallic conductivity derives from a parallel combination of weakly coupled hole-doped graphene sheets.

Original languageEnglish (US)
Article number115428
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number11
DOIs
StatePublished - Mar 16 2010
Externally publishedYes

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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