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Raman Lineshapes of GaP under Pressure
Author(s) -
Ves S.,
Loa I.,
Syassen K.,
Widulle F.,
Cardona M.
Publication year - 2001
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 - 10.1002/1521-3951(200101)223:1<241::aid-pssb241>3.0.co;2-e
Subject(s) - raman spectroscopy , anharmonicity , phonon , hydrostatic pressure , transverse plane , materials science , hydrostatic equilibrium , condensed matter physics , spectral line , range (aeronautics) , analytical chemistry (journal) , chemistry , optics , physics , thermodynamics , structural engineering , engineering , chromatography , quantum mechanics , astronomy , composite material
Raman spectra of 69 GaP were measured at T = 10 K under hydrostatic pressures up to 8 GPa. In the pressure range from 0 to 4 GPa the overall width of the transverse optic (TO) peak is found to decrease from ≈4.2 to ≈0.2 cm —1 and then to remain nearly constant at higher pressures. The dramatic changes in the TO Raman lineshape are attributed to a strong pressure dependence of the third‐order anharmonic decay of the TO mode into phonons of lower energy. Our experimental findings are compared to results of recent first‐principles calculations.