Raman light scattering and c-axis resistivity evidence for a pressure-induced stage transformation in PdAl2Cl8 intercalated graphite

E. McRae, B. Sundqvist, T. Wagberg, P. Jacobsson, R. Vangelisti, and M. Lelaurain
Phys. Rev. B 62, 13757 – Published 15 November 2000
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Abstract

We have examined several samples of first- to third-stage PdAl2Cl8-intercalated graphite under hydrostatic pressures up to 1 GPa. In stage-1 highly oriented pyrolytic graphite–(HOPG) and single-crystal-graphite-based materials, the c-axis resistivity decreases sharply above a few kilobars; pressure release induces a reversible return to the initial value only in the case of the latter sample. Raman spectra taken in situ under pressure on a HOPG-based material show similarly irreversible effects. Analysis of the spectra taken on higher-stage samples leads to the conclusion that hydrostatic pressure beyond a few kilobars increases the density of the intercalate within the graphitic galleries, transforming the initial sample to a higher-stage material. Since there is no loss of intercalate, the overall intercalate-to-host charge transfer remains constant so that the Raman frequency is approximately the same for both first- and second-stage products. This is an unusual situation in which there is thus an apparent lack of Raman signature in spite of the stage change.

  • Received 30 December 1999

DOI:https://doi.org/10.1103/PhysRevB.62.13757

©2000 American Physical Society

Authors & Affiliations

E. McRae1, B. Sundqvist2, T. Wagberg2, P. Jacobsson2,*, R. Vangelisti1, and M. Lelaurain1

  • 1Laboratoire de Chimie du Solide Minéral, UMR C.N.R.S. 7555, Université Henri Poincaré-Nancy 1, Boîte Postale 239, 54506 Vandoeuvre les Nancy Cedex, France
  • 2Department of Experimental Physics, Umå University, S-90187 Umå, Sweden

  • *Present address: Department of Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden.

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Vol. 62, Iss. 20 — 15 November 2000

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