Origin of boson peak in glasses: Role of Ioffe–Regel crossover and atomic soft modes |
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| Affiliation: | Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Tel Aviv, Israel;Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic |
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| Abstract: | A theoretical ‘complete soft-mode-dynamics’ model of the origin and properties of the boson peak accompanied by a high-frequency sound, observed in glasses of a certain type, is described. The origin is determined by interaction of non-acoustic vibrations with acoustic phonons and a Ioffe–Regel crossover for their inelastic scattering. The non-acoustic excitations are associated with vibrations of atomic soft-mode ‘defects’. Two types of boson peak can be predicted in agreement with experiments. |
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