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Lattice Dynamics of GaP under Hydrostatic Pressures
Author(s) -
Patel C.,
Sherman W. F.,
Wilkinson G. R.
Publication year - 1982
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221110229
Subject(s) - phonon , softening , condensed matter physics , raman spectroscopy , lattice (music) , hydrostatic pressure , hydrostatic equilibrium , transverse plane , materials science , physics , mechanics , quantum mechanics , structural engineering , engineering , acoustics
Abstract The “eleven‐parameter” rigid‐ion model is used to describe the lattice dynamics of GaP under variable hydrostatic pressures. The one‐phonon and two‐phonon density of states functions are computed for various pressures and compared with the second order Raman spectrum measured by the authors. The effect of high pressure on the phonon dispersion curves is shown to lead to “softening” in the transverse acoustic modes and this suggests a possible driving mechanism for the phase transformation in this compound.