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- W2029328397 abstract "The phonon properties of partially ${mathrm{CuPt}}_{B}$-ordered ${mathrm{Ga}}_{0.52}{mathrm{In}}_{0.48}mathrm{P}$ with degrees of ordering $ensuremath{eta}=0,$$0.19,$$0.28,$$0.35,$$0.47,$ determined from generalized ellipsometry measurement of the near-band-gap order birefringence, are studied by far-infrared spectroscopic ellipsometry. We determine precise spectra of the anisotropic dielectric functions. With increasing $ensuremath{eta}$ all ${mathrm{Ga}}_{0.52}{mathrm{In}}_{0.48}mathrm{P}$ phonon modes split in E- and ${A}_{1}$-type vibrations with polarization perpendicular and parallel to the sublattice ordering direction, respectively, and the mode frequencies shift continuously. We demonstrate here that the alloy-induced modes previously observed in highly disordered ${mathrm{Ga}}_{0.52}{mathrm{In}}_{0.48}mathrm{P}$ [Phys. Rev. B 64, 155206 (2001)] have their origin in the ordered atomic arrangement of alike group-III atoms. We propose far-infrared dielectric anisotropy as a sensitive measure for sublattice ordering in multinary III-V alloys." @default.
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- W2029328397 date "2002-11-11" @default.
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- W2029328397 title "Far-Infrared dielectric anisotropy and phonon modes in spontaneously CuPt-ordered<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ga</mml:mi></mml:mrow><mml:mrow><mml:mn>0.52</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>In</mml:mi></mml:mrow><mml:mrow><mml:mn>0.48</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant=normal>P</mml:mi></mml:math>" @default.
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- W2029328397 doi "https://doi.org/10.1103/physrevb.66.195204" @default.
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