Neutron scattering investigations of the boson peak
Inelastic neutron scattering is not only capable of determining a generalized vibrational density of states around the boson peak of a glass, but can also be used to get information on the eigenvectors. The eigenvectors determine the dynamic structure factor, which is Q^2S(Q) (Q wavevector) for long...
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| Format: | Article |
| Language: | English |
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Institute for Condensed Matter Physics
2019-12-01
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| Series: | Condensed Matter Physics |
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| Online Access: | https://doi.org/10.5488/CMP.22.43601 |
| Summary: | Inelastic neutron scattering is not only capable of determining a generalized vibrational density of states around the boson peak of a glass, but can also be used to get information on the eigenvectors. The eigenvectors determine the dynamic structure factor, which is Q^2S(Q) (Q wavevector) for long wavelength sound waves. This enables the determination of the sound wave fraction below and at the boson peak, done for SiO_2, B_2O_3, polybutadiene and amorphous germanium. The temperature dependence of the boson peak in silica and glycerol is shown. X-ray Brillouin scattering data show that the damping of the longitudinal sound waves in silica and glycerol follows the soft potential model ω^4 prediction in the limit of low frequency. |
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| ISSN: | 1607-324X 2224-9079 |