Abstract
Inelastic neutron scattering measurements on vitreous silica have revealed that the contribution from the acoustic-like mode along the position of the first sharp diffraction peak (FSDP) is prominent below the boson peak energy and at low temperatures. Strong coupling between this acoustic-like mode at the FSDP position and the boson peak has also been confirmed, which implies the existence of Ioffe-Regel limits in glasses. We propose that the origin of the excitations along the FSDP position can be attributed to the harmonic vibrations at the surface of void spaces in glasses. We also consider that the FSDP in glasses arises from a quasi-periodicity, which is caused by the continuity of void spaces, corresponding to the lattice spacing of crystalline counterparts.
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