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Keywords = A-mode phonon

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9 pages, 2897 KiB  
Article
Optical Parameters of Deuterated Triglycine Sulfate in Terahertz Range
by Kirill Brekhov, Anastasia Gorbatova, Ekaterina Lebedeva, Pavel Avdeev, Andrey Kudryavtsev, Oleg Chefonov, Sergey Zhukov and Elena Mishina
Crystals 2024, 14(12), 1093; https://doi.org/10.3390/cryst14121093 - 19 Dec 2024
Cited by 1 | Viewed by 862
Abstract
In this work, the optical parameters of a 550 μm thick deuterated triglycine sulfate (DTGS) crystal in the range of 0.3–1.5 THz were investigated in low and high fields by time-domain spectroscopy. The X and Z axes of the refractive index ellipsoid were [...] Read more.
In this work, the optical parameters of a 550 μm thick deuterated triglycine sulfate (DTGS) crystal in the range of 0.3–1.5 THz were investigated in low and high fields by time-domain spectroscopy. The X and Z axes of the refractive index ellipsoid were identified, and the refractive indices and extinction coefficients were determined. In addition, it was shown that, in strong THz fields, a phonon A-mode with a frequency of about 40 cm−1 can be excited in the DTGS crystal when the THz wave vector coincides with the polar axis of the crystal and the polarization of the THz radiation coincides with the X-axis of the crystal. The use of the observed effect and the determination of the mode excitation parameters can be twofold. First, they show the limits of the THz field for non-invasive action on the crystal. Second, they present the mode excitation conditions that can be used, for example, in controllable absorbers. Full article
(This article belongs to the Section Inorganic Crystalline Materials)
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10 pages, 1200 KiB  
Article
Anharmonic Effects in Ordered Kesterite-Type Cu2ZnSnS4
by Nicole Suss, Anna Ritscher, Martin Lerch and Ilias Efthimiopoulos
Solids 2021, 2(4), 385-394; https://doi.org/10.3390/solids2040024 - 24 Nov 2021
Cited by 3 | Viewed by 2981
Abstract
We performed an in-depth investigation and analysis of the effect of temperature on the Raman-active A-modes of bulk kesterite-type Cu2ZnSnS4 within the 300–460 K temperature range. We acquired the individual contributions to each Raman mode, namely, the thermal expansion and [...] Read more.
We performed an in-depth investigation and analysis of the effect of temperature on the Raman-active A-modes of bulk kesterite-type Cu2ZnSnS4 within the 300–460 K temperature range. We acquired the individual contributions to each Raman mode, namely, the thermal expansion and anharmonic interactions terms responsible for the Raman shift and broadening with temperature. Our results indicate that the Raman shift with temperature is dominated by the thermal expansion term, whereas the broadening is mainly governed by three-phonon damping processes in this material. Considering relevant results from the literature, it appears that dimensionality is a key factor in regulating the dominant phonon decay mechanism. Full article
(This article belongs to the Special Issue Feature Papers of Solids 2021)
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