Non-random Be-to-Zn substitution in ZnBeSe alloys: Raman scattering and ab initio calculations

Pagès, O.; Postnikov, A. V.; Chafi, A.; Bormann, D.; Simon, Patrick; Firszt, F.; Paszkowicz, W.; Tournié, E.

doi:10.1140/epjb/e2010-00047-0

Cited by 9 publications

(12 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1c), corresponding to Zn-S sensitivities at the scale of first and second neighbors, respectively. In each case we assume a random S M Se substitution [57,58]. The only adjustable parameter per mode is the LO damping c p (x), which determines the Raman linewidth.…”

Section: Zn-s and To Sementioning

confidence: 99%

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Hussein

Pagès

Doyen-Schuler

et al. 2015

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

Section: Zn-s and To Sementioning

confidence: 99%

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Hussein

Pagès

Doyen-Schuler

et al. 2015

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

“…In certain alloy systems where the sizes of the anions and cations are radically different one might suspect that preserving the cation-anion bond lengths become increasingly difficult which, in turn, would considerably affect the phonon behavior of the ternary alloys. In addition to the small size, the light mass of Be is expected to cause atypical phonon properties of Be chalcogenide alloys 7,[49][50][51][52][53][54][55][56][57] and SLs compared to the Zn-based II-VI compound semiconductors of similar crystal structure. Consequently, one would anticipate new phonon features to occur in ͑BeX͒ m / ͑ZnY͒ n SLs ͑Refs.…”

Section: Introductionmentioning

confidence: 99%

“…7,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57] Of particular interest are the TO modes as they consist of quasi-independent oscillators exhibiting 1-bond→ 2-mode behavior in the percolation scheme. 7,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57] In Be x Zn 1−x Se͑Te͒ alloys this atypical phonon mode behavior is explained recently by Pagès et al 49 by using a double-branch percolation model which discriminates between vibrations within the randomly formed hard Be-rich host region and the soft Zn-rich region. Here we have used a traditional formulation of the multilayer 66 optics with appropriate alloy dielectric functions and calculated the IR reflectance spectra of thin Be x Zn 1−x Se/ GaAs͑001͒ epilayer at an oblique incidence ͑cf.…”

Section: Introductionmentioning

confidence: 99%

Optical and vibrational properties of Be-Zn chalcogenide alloys and superlattices

Talwar

2010

Phys. Rev. B

View full text Add to dashboard Cite

The results of a comprehensive theoretical study for the optical and vibrational behavior of Be-Zn chalcogenide alloys and superlattices ͑SLs͒ are presented using a realistic lattice dynamical approach. Ramanscattering data for the zone-center optical modes and the results from first-principles calculations for the elastic, lattice constants, and critical-point phonons are employed in constructing an optimized secondneighbor rigid-ion model for BeS, BeSe, and BeTe. A simple explanation is provided for the unusual characteristics of the optical phonon dispersions found in Be chalcogenides, alloys and ͑BeSe͒ m / ͑ZnSe͒ n SLs compared to those of many other Zn-based II-VI compound semiconductors. An elastic continuum model has offered a strong corroboration to the observed doublets by Raman spectroscopy in the BeTe/ZnSe superlattices near 25-30 cm −1 as the folded LA modes due to mini-zone folding in the z͑xx͒z scattering geometry. By using a standard methodology of multilayer optics with appropriate alloy dielectric functions, we have analyzed the IR reflectance spectra of BeZnSe/GaAs thin epilayers at an oblique incidence with a three-oscillator model. Comparison of our results with the reflectivity data has provided a strong validation to the fact that in the ϳ400-575 cm −1 frequency region there exist at least two types of Be-Se bonds with optical modes involving two kinds of local atomic arrangements.

show abstract

“…(1), with special attention paid to the intensity ratio between the two Be-Se modes. We have discussed in detail elsewhere [15] that this ratio is extremely sensitive to local clustering or anticlustering.…”

Section: The Be-se (Tolo) Raman Picturementioning

confidence: 90%

“…X-ray investigations show that the samples exhibit a single sphalerite 155201-2 (zincblende) phase. We have discussed elsewhere that the Zn ↔ Be substitution can be considered as random in such crystals grown from the melt within the composition domain 10-54 at.% Be [15]. However, a specific analysis of the Zn ↔ Be substitution for the samples used in this work is developed below.…”

Section: A Samplesmentioning

confidence: 99%

Lattice dynamics of the model percolation-type (Zn,Be)Se alloy: Inelastic neutron scattering,ab initiostudy, and shell-model calculations

et al. 2014

Self Cite

View full text Add to dashboard Cite

The random Zn 1-x Be x Se zincblende alloy is known to exhibit a peculiar three-mode [1× (Zn-Se),2× (Be-Se)] vibration pattern near the Brillouin zone (BZ) center, of the so-called percolation type, apparent in its Raman spectra. This is due to an unusually large contrast between the physical properties (length, ionicity) of the constituting bonds. In the present work, the inelastic neutron scattering is applied to study the dispersion of modes away from the BZ center, with special attention to the q dependence of the BeSe-like transverse optic doublet. The discussion is supported by calculations of lattice dynamics done both ab initio (using the SIESTA code) and within the shell model. The BeSe-like doublet is found to survive nearly unchanged throughout the BZ up to the zone edge, indicating that its origin is at the ultimate bond scale. The microscopic mechanism of splitting is clarified by ab initio calculations. Namely, the local lattice relaxation needed to accommodate the contrast in physical properties of the Zn-Se and Be-Se bonds splits the stretching and bending modes of connected, i.e., percolativelike, (Be-Se) bonds.

show abstract

Non-random Be-to-Zn substitution in ZnBeSe alloys: Raman scattering and ab initio calculations

Cited by 9 publications

References 31 publications

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Percolation-type multi-phonon pattern of Zn(Se,S): Backward/forward Raman scattering and ab initio calculations

Optical and vibrational properties of Be-Zn chalcogenide alloys and superlattices

Lattice dynamics of the model percolation-type (Zn,Be)Se alloy: Inelastic neutron scattering,ab initiostudy, and shell-model calculations

Contact Info

Product

Resources

About