INELASTIC NEUTRON-SCATTERING IN SETE GLASSES

Inelastic neutron scattering has been used to study the excitation spectra g(E) of a series of four SexTe1-x glasses, with x = 0.95, 0.90, 0.80, 0.70, at two temperatures, 100K and 200K. The low frequency spectra show a breakaway from an (energy)2 dependence for g(E) to a higher power dependence, which is typical of the density of states for glassy materials. This seems to be very similar for all samples, but the temperature variation of the low frequency part depends upon the Te concentration. At higher energies excitation peaks at about 15 meV and 31 meV are observed and these become more pronounced in the samples which contain more Te. These results are discussed in the light of current ideas about the structure of these materials. © 1990.