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Lattice dynamics of InP 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.2221140120
Subject(s) - phonon , softening , hydrostatic pressure , raman spectroscopy , hydrostatic equilibrium , condensed matter physics , lattice (music) , transverse plane , materials science , ion , physics , optics , mechanics , composite material , quantum mechanics , acoustics , structural engineering , engineering
The lattice dynamics of InP under variable hydrostatic pressures is investigated on the basis of an “eleven‐parameter” rigid‐ion model. The one‐phonon and two‐phonon density of states functions are computed for various pressures and these results are compared with the available second‐order Raman spectra. The mode Grüneisen parameters are calculated at two arbitrary pressures. The effect of high pressure on the phonon dispersion curves is shown to lead to ‘softening’ in the transverse acoustic modes and eventually to a phase transformation of the compound. Interesting effects in the [1, 1, 0] and [1, 1, 1] directions are shown by the transverse acoustic mode gammas with increasing pressure and suggests the domination of short‐range forces in these two directions.