Phonon modes in spontaneously ordered GaInP{sub 2} studied by micro-Raman scattering measurements

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.1888· OSTI ID:527012

Cheong, H M; Alsina, F; Mascarenhas, A; Geisz, J F; Olson, J M ^[1]

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1. National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401 (United States)

We have performed micro-Raman-scattering experiments on ordered GaInP{sub 2} alloy samples in three different geometries where the phonon wave vector is either parallel or perpendicular to the ordering axis of the crystal. By comparing results from the ({bar 1}11) backscattering and right-angle scattering measurements with the C{sub 3v} symmetry of the crystal, we found that the recently discovered peaks at 205 and 354 cm{sup {minus}1} in the Raman spectra of ordered alloys are due to longitudinal-phonon modes with A{sub 1} symmetry in these geometries. In the (110) backscattering geometry, selection-rule forbidden longitudinal-phonon modes appear in the Raman spectra measured in parallel polarizations. Possible mechanisms for this selection-rule violation are discussed. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: National Renewable Energy Laboratory
• DOE Contract Number: AC36-83CH10093
• OSTI ID: 527012
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 4 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
GALLIUM PHOSPHIDES
INDIUM PHOSPHIDES
ORDER PARAMETERS
PHONONS
POLARIZATION
RAMAN SPECTRA
SELECTION RULES
SPECTRAL SHIFT