Evidence for the R8 Phase of Germanium

Brett C. Johnson, Bianca Haberl, Sarita Deshmukh, Brad D. Malone, Marvin L. Cohen, Jeffrey C. McCallum, James S. Williams, and Jodie E. Bradby
Phys. Rev. Lett. 110, 085502 – Published 20 February 2013
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Abstract

The formation of R8 germanium is reported. The β-Sn phase is first induced by the indentation of amorphous germanium (a-Ge) and the resultant phases on pressure release are characterized by Raman scattering. The expected Raman line frequencies for the various phases of Ge are determined from first-principles calculations using density functional perturbation theory of the zone-center phonons in the diamond, ST12, BC8, and R8 Ge phases. In addition to the R8 phase, traces of BC8 may also be present following pressure release.

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  • Received 12 August 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.085502

© 2013 American Physical Society

Authors & Affiliations

Brett C. Johnson1,*, Bianca Haberl2, Sarita Deshmukh2, Brad D. Malone3, Marvin L. Cohen3, Jeffrey C. McCallum1, James S. Williams2, and Jodie E. Bradby2

  • 1School of Physics, University of Melbourne, Victoria 3010, Australia
  • 2Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia
  • 3Department of Physics, University of California, Berkeley, California 94720, USA and Material Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *johnsonb@unimelb.edu.au

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Vol. 110, Iss. 8 — 22 February 2013

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