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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.48 [2010] >
IJPAP Vol.48(08) [August 2010] >
| Title: | Pressure induced phonon stiffening and softening in III-V phosphides |
| Authors: | Shinde, Satyam
Pandya, Ankur
Jha, Prafulla K |
| Keywords: | Lattice dynamics
Grüneisen parameter
Transverse acoustic phonon |
| Issue Date: | Aug-2010 |
| Publisher: | CSIR |
| Abstract: | A
lattice dynamical study of InP, GaP and BP under pressure is reported by using
two lattice dynamical model theories namely, the rigid ion and deformation bond
approximation models. It is observed that the energies of the optical phonons
and longitudinal acoustic phonons stiffen with pressure, while the transverse
acoustic phonon frequency softens. The phonon density of states shows
pronounced shift in the frequency spectra with pressure. The mode Grüneisen
parameter indicates that the TA phonon modes have negative values and
responsible for the lattice softening. The lattice specific heat at constant
volume, CV increases with pressure. The obtained results are,
in general, good agreement with available data. |
| Page(s): | 543-549 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.48(08) [August 2010]
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