Raman line-shape analysis of random and spontaneously ordered GaInP[sub 2] alloy

Journal Article · Thu Sep 15 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.7509· OSTI ID:7229068

Sinha, K; Mascarenhas, A; Horner, G S; Bertness, K A; Kurtz, S R; Olson, J M ^[1]

---

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

We have measured the temperature dependence of the Raman frequency and linewidth of the GaP-like LO phonon of random and spontaneously ordered GaInP[sub 2] alloys. The width of the asymmetric Raman band is strongly influenced by disorder and the anharmonicity of the lattice. The half-width towards the high-energy side of the Raman band of the GaP-like phonon is independent of temperature, while the half-width on the low-energy side does depend on temperature. Though no obvious differences are observed in the temperature dependence of the Raman spectra of the random and the ordered alloys, the GaP-like Raman band of the ordered samples narrows for incident photon energies near the fundamental gap of the alloy. We attribute the narrowing of the Raman band to the inhomogeneities in the material caused by the existence of a statistical distribution of partially ordered domains with different order parameters [eta]. From the observed width of the dispersion of the Raman linewidth as a function of incident photon energies under resonance conditions, it is concluded that samples grown at higher temperatures possess a narrower distribution of domains.

• DOE Contract Number: AC36-83CH10093
• OSTI ID: 7229068
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:11; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
BASIC INTERACTIONS
COUPLING
ELECTROMAGNETIC INTERACTIONS
ELECTRON-PHONON COUPLING
GALLIUM COMPOUNDS
GALLIUM PHOSPHIDES
INDIUM COMPOUNDS
INDIUM PHOSPHIDES
INTERACTIONS
OPTICAL PROPERTIES
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
RAMAN SPECTRA
SPECTRA
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0013-0065 K
UMKLAPP PROCESSES