Abstract
Porous gallium phosphide (GaP) with a honeycomb-likemorphology and a skeleton relative volume concentration c = 0.7was investigated by Raman spectroscopy under pressure up to 10 GPa at T = 5 K.The porous samples were prepared by electrochemical etching. The transverseoptical (TO) and longitudinal optical (LO) mode frequencies were found to shiftwith pressure similarly to those of bulk GaP. As in bulk GaP, the TO feature ofthe porous GaP exhibits a pressure-induced narrowing which is interpreted interms of a Fermi resonance. The scattering intensity observed on thelow-frequency side of the LO mode is attributed to surface-related Fröhlich modescattering. The latter results are interpreted on the basis of an effective mediumexpression for the dielectric function. The Raman spectra indicate that both themorphology and degree of porosity are unaffected by pressure in the rangeinvestigated.
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