Effects of spontaneous ordering on Raman spectra of GaInP{sub 2}

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

DOI:https://doi.org/10.1103/PhysRevB.56.1882· OSTI ID:527011

Cheong, H M; Mascarenhas, A ^[1]; Ernst, P; Geng, C ^[2]

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1. National Renewable Energy Laboratory, 1617 Cole Boulevard, Golden, Colorado 80401 (United States)
2. 4. Physikalisches Institut, Universitaet Stuttgart, D-70550 Stuttgart (Germany)

The effects of spontaneous CuPt{sub B} ordering on the lattice dynamics of GaInP{sub 2} alloys are studied by room-temperature Raman-scattering experiments on a series of GaInP{sub 2} samples with various degrees of ordering, grown by organometallic vapor phase epitaxy. In measurements on the (001) growth plane, we have observed several changes in the optical-phonon range of the Raman spectrum, the most notable of which is the emergence of an extra peak at 354 cm{sup {minus}1}. This peak is identified as a longitudinal-optical mode due to the superlattice effect in the ordered alloys. The acoustic-phonon range of the (001) Raman spectra of the ordered samples shows extra peaks at 60 and 205 cm{sup {minus}1}, which are identified as the folded transverse and longitudinal-acoustic phonons, respectively. For the optical phonons, the Raman selection rules and the identification of the extra peak are tested by measuring right-angle Raman scattering. The results are consistent with the trigonal C{sub 3{nu}} symmetry of the ordered alloys. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: National Renewable Energy Laboratory
• DOE Contract Number: AC36-83CH10093
• OSTI ID: 527011
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 4 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ENERGY GAP
GALLIUM PHOSPHIDES
INDIUM PHOSPHIDES
LATTICE VIBRATIONS
ORDER PARAMETERS
PHONONS
RAMAN SPECTRA
VAPOR PHASE EPITAXY