2002
DOI: 10.1063/1.1467711
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Percolation behavior in the Raman spectra of ZnBeTe alloy

Abstract: Zone-center longitudinal (LO) and transverse (TO) optical phonons of Zn1−xBexTe epilayers are identified by Raman spectroscopy. On top of the expected BeTe- and ZnTe-like modes, which obey the modified-random-element-isodisplacement model, we observe an extra BeTe-like (TO, LO) doublet at intermediate x values. It has the same atypical characteristics as its BeSe-like counterpart in ZnBeSe alloy. Its activation validates our percolative picture for multimode description in Be–chalcogenide alloys that open the … Show more

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Cited by 30 publications
(32 citation statements)
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“…Altogether this might explain why random Zn 1−x Be x ͑Se, Te͒ mixed crystals of high quality, regarding x-ray measurements, can be formed over wide composition ranges. 4,5 In particular, the full range is available with ZnBeSe, while the Be content is limited to ϳ0.5 in ZnBeTe. This offers much interesting opportunity for detailed investigation of percolation effects upon the physical properties of the stiff Be-VI bond.…”
Section: Introductionmentioning
confidence: 99%
“…Altogether this might explain why random Zn 1−x Be x ͑Se, Te͒ mixed crystals of high quality, regarding x-ray measurements, can be formed over wide composition ranges. 4,5 In particular, the full range is available with ZnBeSe, while the Be content is limited to ϳ0.5 in ZnBeTe. This offers much interesting opportunity for detailed investigation of percolation effects upon the physical properties of the stiff Be-VI bond.…”
Section: Introductionmentioning
confidence: 99%
“…3͒, even at larger substitution of 14%. 8 At this stage it is feared that the requised condition of dӷd c for Raman analysis of GaAsN in TO symmetry generates such poor crystalline quality that the intrinsic N r rate is altered. This is ruled out below.…”
mentioning
confidence: 99%
“…Raman analysis is performed in geometries ͑1͒ and ͑2͒ with nonresonant 647.1 nm Ar ϩ excitation, which is relevant at low x. 8 The spectra in geometry ͑1͒ obtained with GaAs 1Ϫx N x are shown in Fig. 1.…”
mentioning
confidence: 99%
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