Soft phonon mode and mode coupling in SbSI

Harbeke, G.; Steigmeier, E. F.; Wehner, R.K.

doi:10.1016/0038-1098(70)90391-1

Cited by 59 publications

(10 citation statements)

References 16 publications

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“…This means that the phase transition is of the displacive type. This result is consistent with light scattering studies (Petzelt, 1969;Perry and Agrawal, 1970;Harbeke et al, 1970).…”

Section: (T)supporting

confidence: 94%

Α study of the crystal structure in ferroelectric SbSI

Itoh¹,

Matsunaga²

1980

Zeitschrift Für Kristallographie - Crystalline Materials

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“…This means that the phase transition is of the displacive type. This result is consistent with light scattering studies (Petzelt, 1969;Perry and Agrawal, 1970;Harbeke et al, 1970).…”

Section: (T)supporting

confidence: 94%

Α study of the crystal structure in ferroelectric SbSI

Itoh¹,

Matsunaga²

1980

Zeitschrift Für Kristallographie - Crystalline Materials

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“…As the frequency of oS increases we do not observe any coupling with another mode as it has been observed in some ferroelectrics [7].…”

Section: Resultsmentioning

confidence: 52%

Soft mode in thiourea by Raman measurements

Delahaigue

Khelifa

Jouve

1975

Physica Status Solidi (b)

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Raman measurements have been carried out on the soft mode of thiourea and the wave vector and temperature dependence of the soft mode frequency ( 0 s ) are observed. The longitudinal ( w~L ) and transverse (OJST) frequencies are used to derive a comparison between the dielectric constant obtained from the LST relation and that obtained from standard measurements of the capacitance.Nous avons btudie en diffusion Raman la frbquence 05 du mode mou du monocristal de thiouree en fonction de la temperature et du vecteur d'onde. Nous avons observe les frequences longitudinale OSL et transverse WST en fonction de la temperature. Nous avons compare la valeur de la constante diblectrique statique 8; obtenue 21 partir de la relation de LST et celle obtenue par mesure de capacite.

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“…Also, from the infrared reflectivity measurements, the optical mode is the temperature dependent with decreasing temperature from the paraelectric phase in SbSI [11], as stated previously [12]. The soft mode coupling with the 30 cm ¡1 mode [13] and, the coupling between the 48 cm ¡1 and 41 cm ¡1 modes have been observed for the pressure induced phase transition in SbSI [12]. It has been stated that under the influence of the anharmonicity, the soft mode splits [14] and different compounds of the soft mode appear in IR and millimeter wave spectra.…”

Section: Introductionsupporting

confidence: 63%

Temperature and pressure dependence of the Raman intensity and frequency of a soft mode near the tricritical point in the ferroelectric SbSI

Yurtseven

Duman

2016

Ferroelectrics

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We analyze the pressure dependence of the intensity and the frequency of a soft mode from the Raman and elastic light scattering experiments as reported in the literature close to the ferroelectricparaelectric transition in SbSI crystal. The Raman intensity of this mode is analyzed as a function of pressure at constant temperatures of 272 K (first order transition) and 234 K (tricritical or second order transition) according to a power-law formula. Our analysis of the Raman intensity gives closely the mean field values for the order parameter. From our analysis, we also obtain that the Raman frequency (squared) of the soft mode varies linearly with the pressure at constant temperatures close to the ferroelectric -paraelectric transition in SbSI as obtained experimentally.

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Soft phonon mode and mode coupling in SbSI

Cited by 59 publications

References 16 publications

Α study of the crystal structure in ferroelectric SbSI

Α study of the crystal structure in ferroelectric SbSI

Soft mode in thiourea by Raman measurements

Temperature and pressure dependence of the Raman intensity and frequency of a soft mode near the tricritical point in the ferroelectric SbSI

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