Surface Phonons and Soft Bulk Modes in LiCsSO<sub>4</sub> Crystals Studied by the High Resolution Brillouin Scattering

Trzaskowska, A.; Mielcarek, S.; Mróz, B.; Andrews, G. Todd

doi:10.1080/00150190802026085

Cited by 2 publications

(3 citation statements)

References 18 publications

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“…At the ferroelastic phase transition temperature

= 202 K, both curves show a kink in agreement with Refs. [ 17 , 18 , 19 ], which is due to the spin–phonon interaction. Above

, the phonon energy slightly decreases, in agreement with Refs.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…The highest frequency range includes bands identified as modes derived from the stretching vibrations, specifically

= 1016 cm −1 , and

, at frequencies between 1110 and 1200 cm −1 . The behavior of the surface phonons in the vicinity of the phase transition temperature

was studied by Trzaskowska et al [ 18 , 19 ] using Brillouin spectroscopy. Recently, the size effects of the linear permittivity

in ferroelastic LCS nanoparticles (NPs) were investigated by Milinskiy et al [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Apostolov,

Apostolova,

Wesselinowa

2024

Materials

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Using a microscopic model, the temperature dependence of two phonon modes, ω0 = 32 cm−1 and 72 cm−1, and their damping of the ferroelastic LiCsSO4 compound, are calculated within Green’s function technique. It is observed that the first mode increases whereas the second one decreases with increasing temperature T. This different behavior is explained with different sign of the anharmonic spin–phonon interaction constant. At the ferroelastic phase transition temperature TC, there is a kink in both modes due to the spin–phonon interaction. The phonon damping increases with T, and again shows an anomaly at TC. The contributions of the spin–phonon and phonon–phonon interactions are discussed. TC is reduced by decreasing the nanoparticle size, and can be enhanced by doping with K, Rb and NH4 ions at the Cs site. TC decreases by doping with Na, K or Rb on the Li site. The specific heat Cp also shows a kink at TC. Cp decreases with decreasing nanoparticle size and the peak disappears, whereas Cp increases with increasing K ion doping concentration.

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“…At the ferroelastic phase transition temperature

= 202 K, both curves show a kink in agreement with Refs. [ 17 , 18 , 19 ], which is due to the spin–phonon interaction. Above

, the phonon energy slightly decreases, in agreement with Refs.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…The highest frequency range includes bands identified as modes derived from the stretching vibrations, specifically

= 1016 cm −1 , and

, at frequencies between 1110 and 1200 cm −1 . The behavior of the surface phonons in the vicinity of the phase transition temperature

was studied by Trzaskowska et al [ 18 , 19 ] using Brillouin spectroscopy. Recently, the size effects of the linear permittivity

in ferroelastic LCS nanoparticles (NPs) were investigated by Milinskiy et al [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Apostolov,

Apostolova,

Wesselinowa

2024

Materials

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show abstract

“…In the direction of propagation of the soft bulk mode in the LCS crystal, in the two principal planes (010) and (001) a local displacement of the atomic planes takes place. The behaviour of the surface phonon propagating in the [100] direction in the two principal planes correlates with the bulk displacement of the soft mode; see more details in Ferroelectrics [17]. Therefore, surface phonons in near-surface layers of increasing thickness are increasingly disturbed by the soft bulk mode.…”

Section: Resultsmentioning

confidence: 99%

Surface phonons in LiCsSO₄crystal studied by high-resolution Brillouin scattering

Trzaskowska¹,

Mielcarek²,

Mróz³

2008

J. Phys.: Condens. Matter

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Surface Phonons and Soft Bulk Modes in LiCsSO₄ Crystals Studied by the High Resolution Brillouin Scattering

Cited by 2 publications

References 18 publications

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Surface phonons in LiCsSO₄crystal studied by high-resolution Brillouin scattering

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Surface Phonons and Soft Bulk Modes in LiCsSO4 Crystals Studied by the High Resolution Brillouin Scattering

Cited by 2 publications

References 18 publications

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Theoretical Study of the Phonon Energy and Specific Heat of Ion-Doped LiCsSO4—Bulk and Nanoparticles

Surface phonons in LiCsSO4crystal studied by high-resolution Brillouin scattering

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Surface Phonons and Soft Bulk Modes in LiCsSO₄ Crystals Studied by the High Resolution Brillouin Scattering

Surface phonons in LiCsSO₄crystal studied by high-resolution Brillouin scattering