Pressure Induced Mode Softening in Ge
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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 ω<SUP>2</SUP> strictly linear in pressure P.
- 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