A Neutron Scattering Study of Lattice Dynamics of HgTe and HgSe

Kępa, H.; Giebułtowicz, T. M.; Buras, B.; Lebech, B.; Clausen, K.N.

doi:10.1088/0031-8949/25/6a/040

Cited by 48 publications

(19 citation statements)

References 14 publications

(10 reference statements)

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“…In this version both the first-and the second-neighbour interactions are described by tensor coupling parameters in their most general form. A reasonable agreement between the theoretical curves and experimental points was obtained when we used the values.of RIM parameters previously applied for HgTe and HgSe [1,2] (except for the atomic masses, lattice parameter and effective charge values). We did not attempt to adjust the parameters of the model on the experimental data of the acoustic modes.…”

supporting

confidence: 60%

“…The lattice dynamics of HgTe and HgSe is relatively well known. In particular, in spite of the high neutron absorption cross-section of natural mercury and the high non-coherent scattering the acoustic phonon dispersion curves were determined by inelastic neutron scattering for both compounds, while the optical modes were investigated for HgTe only [1,2]. The optical mode frequencies corresponding to the selected high symmetry points of the Brillouin zone were determined for HgSe from both infrared reflectivity and Raman scattering measurements (see, e.g., [3,4]).…”

mentioning

confidence: 99%

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Lattice Dynamics of Cubic Mercury Sulphide

et al. 1996

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The acoustic phonon dispersion of mercury sulphide of zinc-blende structure (β-HgS) was studied by inelastic neutron scattering. The measurements were carried out at 19 K and 295 K on HgS crystals doped with Fe. A slight decrease in phonon frequencies with increasing temperature was found, the temperature dependence being the strongest for LA phonons with [, , 0] propagation. From acoustic phonon dispersion the values of selected elastic constants were determined for β-ΗgS.PACS numbers: 62.20. Dc, Mercury chalcogenides crystallizing in the sphalerite (zinc blende) stucture have been intensively investigated in the past due to their attractive physical properties, resulting from the zerogap band structure. The lattice dynamics of HgTe and HgSe is relatively well known. In particular, in spite of the high neutron absorption cross-section of natural mercury and the high non-coherent scattering the acoustic phonon dispersion curves were determined by inelastic neutron scattering for both compounds, while the optical modes were investigated for HgTe only [1,2]. The optical mode frequencies corresponding to the selected high symmetry points of the Brillouin zone were determined for HgSe from both infrared reflectivity and Raman scattering measurements (see, e.g., [3,4]). The stable crystal stucture of third chalcogenide (mercury sulphide) is a hexagonal one (cinnabar, α-HgS). However, as it was recently shown, good quality monocrystals of the metastable sphalerite phase (β-ΗgS) can be obtained by doping mercury sulphide with small amount (about 2%) of a selected transition metal [5].Big size (above 1 cm 3 ) perfect monocrystals of β-ΗgS were grown in the Institute of Physics, Polish Academy of Sciences in Warsaw by the modified Bridgman

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confidence: 99%

Lattice Dynamics of Cubic Mercury Sulphide

et al. 1996

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“…Correction to model A: 2 = -0.471 (S. K. Sinha, private communication); (e) Vandevyver & Plumelle (1978); (f) Dolling & Waugh (1965); (g) Borcherds & Kunc (1978); (h) ; (i) Price, Rowe & Nicklow (1971); (j) Jaswal (1978c); (k) Talwar, Vandevyver & Zigone (1980); (l) Vagelatos, Wehe & King (1974); (m) Jaswal (1978a); (n) Plumelle and Vandevyver (1976); (o) Rowe,Nicklow,Price & Zanio (I 974); (p) Kepa, Giebultowicz, Burras, Lebech & Clausen (1982), parameters in private communication from H. Kepa; (q) Kepa et al (1982), parameters from Kepa (1980); (r) Prevot, Hennion & Dorner (1977), published parameters are inadequate; those to full accuracy obtained from B. Prevot (private communication); (s) Jaswal (1978b); (t) Plumelle, Talwar, Vandevyver, Kunc & Zigone (1979) Table 1 summarizes all the materials and the source lattice dynamical models considered here. These models are the best ones available, all having been fitted to phonon frequencies measured by neutron scattering.…”

Section: The Calculationsmentioning

confidence: 99%

Debye–Waller factors of zinc-blende-structure materials – a lattice dynamical comparison

Reid¹

1983

Acta Cryst Sect A

140

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Lattice dynamical calculations to the full accuracy of the models are presented for the Debye-Waller B values for 17 zinc-blende-structure materials over the temperature range 1 to 1000 K (where appropriate). The materials are GaP, GaSb, GaAs, InP, InSb, InAs, ZnO, ZnS, ZnSe, ZnTe, CdTe, HgSe, HgTe, CuC1, CuBr, CuI and SiC. The models considered were the best lattice dynamical models available that have been fitted to phonon frequencies measured by neutron scattering. These include the shell model, the valenceshell model, the deformation-dipole model, the deformation-ion model and the rigid-ion model. From one to five models were used for each material, depending on the availability of published parameters. For some materials different parametrizations of the same model were examined. Intermodel comparisons show that the substantial difference in B values predicted by different models is attributable principally to the different eigenvectors they produce. Comparisons with fairly recent experimental results highlight the paucity of reliable measured values as a function of temperature and the unreliability and frequent inadequacy of models. The 14-parameter shell model is generally found to be the best.

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“…However, the experimental data obtained with high spectral resolution revealed a new feature close to the expected position of upper edge of the LO phonon frequency band, which may exceed the center of zone value by as much as 20 cm -1 [5]. In Fig.…”

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confidence: 52%

Influence of Plasmon-Phonon Coupling on the Electron-Impurity Interaction in the Free-Carrier Absorption

1995

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An experimental and theoretical evidence that the electron-impurity scattering is modified in the presence of the electromagnetic field oscillating with the frequency corresponding to the optical phonon energy is given. The coupled plasmon-phonon mode related feature in the reflectivity spectrum can be used to determine the upper edge of the LO phonon frequency band in highly doped materials.PACS numbers: 71.45. Gm, 78.30.Fs, 72.30.+q The infrared absorption in semiconductors is mainly caused by phonons and free carriers. In many cases these mechanisms can be treated separately, each of them giving its own contribution to the optical dielectric function. The simple Drude-Zener theory assuming frequency independent damping conStants of free-carrier plasma and phonon excitations, satisfactorily describes most of the experimental reflectivity and transmission spectra in the infrared.A deviation from thiS model can be expected when the light frequency approaches the optical phonon energy band. Strong mixing of the electron plasma and polar phonon modes leading to the collective motion of electrons and lattice ions causes a significant modification of the effective scattering of electrons by impurities [1]. This effect should reflect on the electron-impurity scattering rate giving a structure in the optical spectra at the energy corresponding to the upper edge of the LO phonon frequency band.Most studies of the role of the dynamic screening in the free-carrier absorption were devoted to the question of plasmon excitation in the process of electron-impurity scattering (for the references see, e.g., [2]). In this paper we

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A Neutron Scattering Study of Lattice Dynamics of HgTe and HgSe

Cited by 48 publications

References 14 publications

Lattice Dynamics of Cubic Mercury Sulphide

Lattice Dynamics of Cubic Mercury Sulphide

Debye–Waller factors of zinc-blende-structure materials – a lattice dynamical comparison

Influence of Plasmon-Phonon Coupling on the Electron-Impurity Interaction in the Free-Carrier Absorption

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