Davydov splitting and rigid-layer modes in InS crystal

Gasanly, Nizami; Faradzhev, F.E.; Ragimov, A. S.; Burlakov, V. M.; Goncharov, Alexander F.; Vinogradov, E. A.

doi:10.1016/0038-1098(82)90221-6

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Fig. 2 presents the Raman spectra of InS at 10 and 300 K. The phonon spectra of InS have been reported previously at room temperature from Raman and infrared measurements [5,13,14]. The present assignment of the observed modes is in excellent agreement with that of Ref.…”

Section: Resultssupporting

confidence: 87%

Temperature dependence of the Raman-active phonon frequencies in indium sulfide

Gasanly

Özkan

Aydınlı

et al. 1999

Solid State Communications

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Cataloged from PDF version of article.The temperature dependence of the Raman-active mode frequencies in indium sulfide was measured in the range from 10 to 300 K. The analysis of the temperature dependence of the A(g) intralayer optical modes show that Raman frequency shift results from the change of harmonic frequency with volume expansion and anharmonic coupling to phonons of other branches. The pure-temperature contribution (phonon-phonon coupling) is due to three- and four-phonon processes. (C) 1999 Elsevier Science Ltd. All rights reserved

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Section: Resultssupporting

confidence: 87%

Temperature dependence of the Raman-active phonon frequencies in indium sulfide

Gasanly

Özkan

Aydınlı

et al. 1999

Solid State Communications

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“…We then calculate (ω 0 /Δ) 2 , which represents the ratio of intralayer to interlayer bonding strength from the relation ω ± = (ω 0 2 ± Δ 2 ) 1/2 which is valid for a pair of weakly coupled identical oscillators. 46,54,55 Here, ω 0 is the isolated (unperturbed) oscillator frequency, and Δ 2 is proportional to the coupling force constant. 46,54,55 Tables 1 and 2 summarize this analysis for the doublets centered at 716 and 851 cm −1 .…”

Section: Nano Lettersmentioning

confidence: 99%

“…46,54,55 Here, ω 0 is the isolated (unperturbed) oscillator frequency, and Δ 2 is proportional to the coupling force constant. 46,54,55 Tables 1 and 2 summarize this analysis for the doublets centered at 716 and 851 cm −1 . As a reminder, these modes are assigned as oxygen stretching around Ge and Cu, respectively.…”

Section: Nano Lettersmentioning

confidence: 99%

“…The infrared and Raman branch frequencies (for each pair) are defined as ω + and ω – , respectively. We then calculate (ω 0 /Δ) 2 , which represents the ratio of intralayer to interlayer bonding strength from the relation ω ± = (ω 0 2 ± Δ 2 ) 1/2 which is valid for a pair of weakly coupled identical oscillators. ,, Here, ω 0 is the isolated (unperturbed) oscillator frequency, and Δ 2 is proportional to the coupling force constant. ,, Tables and summarize this analysis for the doublets centered at 716 and 851 cm –1 . As a reminder, these modes are assigned as oxygen stretching around Ge and Cu, respectively. , Tables S2–4 summarize the results for other pairs.…”

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confidence: 99%

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Charge and Bonding in CuGeO₃ Nanorods

O’Neal

al-Wahish

et al. 2018

Nano Lett.

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We combine infrared and Raman spectroscopies to investigate finite length scale effects in CuGeO nanorods. The infrared-active phonons display remarkably strong size dependence whereas the Raman-active features are, by comparison, nearly rigid. A splitting analysis of the Davydov pairs reveals complex changes in chemical bonding with rod length and temperature. Near the spin-Peierls transition, stronger intralayer bonding in the smallest rods indicates a more rigid lattice which helps to suppress the spin-Peierls transition. Taken together, these findings advance the understanding of size effects and collective phase transitions in low-dimensional oxides.

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