2004
DOI: 10.1103/physrevb.70.155319
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Long-wave phonons inZnSeBeSemixed crystals: Raman scattering and percolation model

Abstract: We extend to longitudinal-optical (LO) phonons the percolation model set for the basic understanding of the atypical transverse-optical (TO) one-bond→ two-mode behavior observed by Raman scattering in the Be-Se spectral range of the random Zn 1−x Be x Se alloy ͑0 ഛ x ഛ 1͒, which opens the class of mixed crystals with contrast in the bond stiffness. The study is supported by contour modeling of the TO and LO Raman line shapes. This is achieved via application of the Hon and Faust treatment to a version of the m… Show more

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Cited by 31 publications
(66 citation statements)
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“…Also, the red-asymmetry of the overall Zn-Te signal, due to the extra mode, increases with x, as expected if the strengths of the extra and dominant Zn-Te TO modes scale as the corresponding Be-Te counterparts, i.e. as x and 1-x, respectively [1]. In fact the Zn-Te TO lineshapes calculated via Eq.…”
Section: Methodsmentioning
confidence: 89%
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“…Also, the red-asymmetry of the overall Zn-Te signal, due to the extra mode, increases with x, as expected if the strengths of the extra and dominant Zn-Te TO modes scale as the corresponding Be-Te counterparts, i.e. as x and 1-x, respectively [1]. In fact the Zn-Te TO lineshapes calculated via Eq.…”
Section: Methodsmentioning
confidence: 89%
“…In particular the dominant Zn-Te peak continuously blue-shifts when x increases, while the extra mode has a fixed frequency at x ≤ 0.19 ('fractal-like' regime, [1]) and blue-shifts for higher x ('normal' regime, [1]), as shown in Fig. 1.…”
Section: Methodsmentioning
confidence: 89%
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“…The value of S 1 /S 1 v (S 1 v is the slope of the first coordination bond length described with Vegard's law under VCA) was 18% in GaAs x P 1-x [7]. In Zn 1-x Raman measurements and theoretical calculations indicate that, the stiffer Be-Se bond is expected to show a two mode behavior corresponding to its location in the hard and soft regions of the mixed crystal [3] and are ~ 2.24 Å and 2.28 Å for "x" close to the lower threshold of percolation. The fact that good fits to the χ(q) data are obtained by using a single Be-Se bond, indicates that in the present experiment, EXAFs measurements donot explicitly distinguish the presence of the two different bond lengths by the EXAFS data analysis.…”
Section: Methodsmentioning
confidence: 99%
“…Besides its technological importance, the Raman data of this material system shows a novel and atypical three mode behavior, ie, a single mode for Zn-Se bond and a two-mode behavior for the Be-Se bond [3] in complete contradiction to the Modified Random Element Isodisplacement (MREI) model [3]. This observation has been explained by invoking the fact that the Be atoms, in the mixed crystal, can be in a Be rich domain (Be atoms connected to each other forming a chain and referred to as hard like (HL) region) and a Zn rich domain (isolated Be atom or small clusters surrounded by Zn atoms referred to as soft like (SL) region) [3]. The HL and SL regions in the system result in two different force constants for the Be-Se bonds, which show up as two different modes in the Raman data.…”
Section: Introductionmentioning
confidence: 99%