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Raman Modes in Porous GaP under Hydrostatic Pressure
Author(s) -
Tiginyanu I. M.,
Ursaki V. V.,
Raptis Y. S.,
Stergiou V.,
Anastassakis E.,
Hartnagel H. L.,
Vogt A.,
Prévot B.,
Schwab C.
Publication year - 1999
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/(sici)1521-3951(199901)211:1<281::aid-pssb281>3.0.co;2-#
Subject(s) - raman spectroscopy , hydrostatic pressure , materials science , porosity , hydrostatic equilibrium , porous medium , mechanics , optics , composite material , physics , quantum mechanics
Bulk and free‐standing porous membranes of GaP have been characterised by Raman spectroscopy under hydrostatic pressure, with emphasis to the Fröhlich surface vibration mode. Under compression, an increase in the frequency gap between the Frîhlich mode and the LO phonon has been observed, which is attributed to pressure‐induced changes in the anharmonicity of the surface‐related modes and, possibly, to the relative increase of the dielectric constant of the surrounding effective medium, through better wetting under compression.