Effect of Pressure on the Anomalous Raman Spectrum of CuBr

Manjón, F. J.; Serrano, Justin Raymond; Loa, I.; Syassen, K.; Lin, C. T.; Cardona, M.

doi:10.1002/1521-3951(200101)223:1<331::aid-pssb331>3.0.co;2-e

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…The Fermi resonance is a rare phenomenon in solids that has been observed in copper halides, molecules and defect modes. [76][77][78][79] In SnSb2Te4, the sum of the frequencies of the Ag 1 and Eg 1 at  almost coincides in frequency with the Eg 2 mode at 2 GPa; i.e. the pressure range close to the onset of the softening of this mode in SnSb2Te4 (Figure 6).…”

Section: Raman Scattering Measurements Under Pressurementioning

confidence: 99%

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

et al. 2020

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High pressure X-ray diffraction, Raman scattering and electrical measurements, together with theoretical calculations, which include the analysis of the topological electron density and electronic localization function, evidence the presence of an isostructural phase transition around 2 GPa, a Fermi resonance around 3.5 GPa and a pressure-induced decomposition of SnSb2Te4 into the high-pressure phases of its parent binary compounds (-Sb2Te3 and SnTe) above 7 GPa. The internal polyhedral compressibility, the behavior of the Raman-active modes, the electrical behavior and the nature of its different bonds under compression have been discussed and compared with their parent binary compounds and with related ternary materials. In this context, the Raman spectrum of SnSb2Te4 exhibits vibrational modes that are associated but forbidden in rocksalt-type SnTe; thus showing a novel way to experimentally observe the forbidden vibrational modes of some compounds. Here, some of the bonds are identified with metavalent bonding, which were already observed in their parent binary compounds. The behavior of SnSb2Te4 is framed within the extended orbital radii map of BA2Te4 compounds, so our results pave the way to understand the pressure behavior and stability ranges of other "natural van der Waals" compounds with similar stoichiometry.

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Section: Raman Scattering Measurements Under Pressurementioning

confidence: 99%

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

et al. 2020

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“…In recent low-temperature Raman studies of Si, Ge, CuCl, CuBr and GaP [56][57][58][59] it was demonstrated that pressure-induced changes in the TO and/or LO line widths can be well explained by variations in the rate at which zone-centre optical phonons decay into zero-wavevector two-phonon combinations due to third-order anharmonic coupling. The anharmonic line broadening is determined by the imaginary part (ω) of the phonon selfenergy, which is proportional to the q = 0 two-phonon density of states weighted by thermal population factors [55].…”

Section: Raman Line Widthsmentioning

confidence: 99%

Vibrational properties of ZnTe at high pressures

Camacho

Loa

Cantarero

et al. 2002

J. Phys.: Condens. Matter

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Raman spectra of ZnTe were measured under hydrostatic pressures up to 15 GPa at T = 300 K. Results for the frequencies of first- and second-order Raman features of the zincblende phase (0-9.5 GPa) are used to set up a rigid-ion model of the phonon dispersion relations under pressure. Calculated phonon densities of states, mode Grüneisen parameters and the thermal expansion coefficient as a function of pressure are discussed. The effect of pressure on the widths and intensities of Raman spectral features is considered. Raman spectra of high-pressure phases of ZnTe are reported. These spectra indicate the possible existence of a new phase near 13 GPa, intermediate between the cinnabar and orthorhombic (Cmcm) phases of ZnTe.

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Layered topological semimetal GaGeTe: New polytype with non-centrosymmetric structure

Gallego-Parra¹,

Bandiello²,

Liang³

et al. 2022

Materials Today Advances

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Effect of Pressure on the Anomalous Raman Spectrum of CuBr

Cited by 6 publications

References 30 publications

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

Vibrational properties of ZnTe at high pressures

Layered topological semimetal GaGeTe: New polytype with non-centrosymmetric structure

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Effect of Pressure on the Anomalous Raman Spectrum of CuBr

Cited by 6 publications

References 30 publications

Characterization and Decomposition of the Natural van der Waals SnSb2Te4 under Compression

Characterization and Decomposition of the Natural van der Waals SnSb2Te4 under Compression

Vibrational properties of ZnTe at high pressures

Layered topological semimetal GaGeTe: New polytype with non-centrosymmetric structure

Contact Info

Product

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Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression

Characterization and Decomposition of the Natural van der Waals SnSb₂Te₄ under Compression