Soft-mode-dynamics model of anomalous thermal vibrational properties of glasses

Soft-mode related origin of the boson peak and acoustic-phonon broadening in glasses

“…Moreover, the group velocity V eff is much smaller than s 0 : V eff ≈ (a 2 1 ν eff γ eff ) 1/2 a 1 ν BP ≈ 0.1s 0 with the respective effective frequency and width ν eff ≈ ν BP ≈ 1 THz and 2γ eff ≈ ν BP . This qualitative picture is helpful for explaining the nature of the thermal conductivity "plateau" in the glasses under discussion [13], [19].…”

Происхождение Бозонного Пика И Уширения Акустических Фононов В Стеклах, Связанное С Мягкими Модами

“…1s 0 при эффективных частоте и ширине соответственно ν eff ≈ ν БП ≈ 1 ТГц и 2γ eff ≈ ν БП . Эта качественная картина полезна при объяснении природы "плато" в теплопроводности рассматриваемых стекол [19], [13].…”

Boson peak in Sm-Al-Co ternary metallic glasses and its possible structural origin

“…the mode-coupling model, [8,9] the soft-mode-dynamics (SMD) model, [10] and the Euclidean random matrices approach, [11] were proposed for describing the vibration dynamic anomalies, as well as the associated thermal anomaly, [12] in glassy matters under consideration. None of these theories has yet fully described every aspect of the physical origin of the BP.…”