Pressure Induced Mode Softening in Ge.

• Klotz S.

  Physique des Milieux Condensés, Université P&M Curie

• Besson J. M.

  Physique des Milieux Condensés, Université P&M Curie

• Braden M.

  Laboratoire Léon Brillouin, CE-Saclay

• Karch K.

  IFTO, Friedrich-Schiller-Universität

Abstract

A complete set of transverse acoustic phonon frequencies of Ge has been measured at pressures to 9. 7 GPa by inelastic neutron scattering and studied by ab initio calculations using density functional perturbation theory. The measurements provide for the first time q-dependent Grüneisen parameters for all TA-modes along high symmetry directions. At the X and L points, the pressure dependence of the phonon frequency ω is shown to be that of a classical soft mode with ω² strictly linear in pressure P.

Journal

• The Review of High Pressure Science and Technology

  The Review of High Pressure Science and Technology 7 718-720, 1998

  The Japan Society of High Pressure Science and Technology

Keywords

• semiconductors
• acoustic phonons
• soft mode
• inelastic neutron scattering

Details

• CRID: 1390282679357347840
• NII Article ID: 10002691577
• NII Book ID: AN10452913
• DOI: 10.4131/jshpreview.7.718
• ISSN: 13481940
• ISSN: 0917639X
• NDL BIB ID: 4494033
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4494033
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed