J. Pelous et al., LOW-FREQUENCY RAMAN-SCATTERING IN OXIDE GLASSES, Philosophical magazine. B. Physics of condensed matter. Structural, electronic, optical and magnetic properties, 71(4), 1995, pp. 693-700
In the low-frequency regime, the Raman spectrum of most glasses is dom
inated by a strong broad line which is usually called the Boson peak.
The physical origin of this peak is still a matter for discussion. Sev
eral attempts have been made in order to connect the Boson peak to the
vibrational density of states. Various interpretations have been prop
osed in recent years, in which the Boson peak is related to structural
characteristics. In order to investigate the relationship between the
vibrational dynamics and the medium-range order in glasses, we have s
tudied the Brillouin and Raman scattering of several samples of oxide
glasses prepared and stabilized under very different conditions. A stu
dy of the first sharp diffraction peak (FSDP) on the same samples show
s that the two features, FSDP and Boson peak, are not clearly correlat
ed. The results are discussed on the basis of the relationship between
the mean free path of phonons and the low-frequency Raman intensity.