Electrical resistivity of single-crystal graphite under pressure: An anisotropic three-dimensional semimetal

L. Edman, B. Sundqvist, E. McRae, and E. Litvin-Staszewska
Phys. Rev. B 57, 6227 – Published 15 March 1998
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Abstract

The in-plane (ρa) and c-axis (ρc) resistivities of natural single-crystal graphite have been measured from 4 to 450 K at zero pressure and from 77 to 450 K under pressures up to 500 MPa. Data for ρc differ strongly from earlier results obtained on synthetic graphite in showing a strong T dependence of the pressure coefficient, while data for ρa agree well with those from previous studies. Our results can be analyzed quantitatively in a simple free-electron model, and we conclude that in contrast to quasi-two-dimensional synthetic graphite, natural single-crystal graphite is an anisotropic three-dimensional semimetal.

  • Received 25 August 1997

DOI:https://doi.org/10.1103/PhysRevB.57.6227

©1998 American Physical Society

Authors & Affiliations

L. Edman and B. Sundqvist

  • Department of Experimental Physics, Umeå University, S-90187 Umeå, Sweden

E. McRae

  • Laboratoire de Chimie du Solide Minéral, URA CNRS 158, Université Henri Poincaré, Nancy I, Boîte Postale 239, F-54506 Vandœuvre-lès-Nancy Cédex, France

E. Litvin-Staszewska

  • High Pressure Research Center UNIPRESS, Polish Academy of Sciences, Sokolowska 29, 01 142 Warsaw, Poland

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Vol. 57, Iss. 11 — 15 March 1998

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