Neutron scattering evidence on the nature of the boson peak
| dc.creator | Buchenau, U. | |
| dc.creator | Wischnewski, A. | |
| dc.creator | Ohl, M. | |
| dc.creator | Fabiani, E. | |
| dc.date | 2004-07-06 | |
| dc.date.accessioned | 2026-07-07T02:59:02Z | |
| dc.date.available | 2026-07-07T02:59:02Z | |
| dc.description | A close inspection of neutron spectra of glass formers in the frequency region above the boson peak does not show the constant eigenvalue density expected for a random dynamical matrix, but a slow decrease towards higher eigenvalues. In 1,4-polybutadiene and selenium, the slope becomes steeper with increasing temperature in the undercooled liquid, suggesting an influence of the vibrational entropy. One can describe the behaviour quantitatively in terms of a balance between level repulsion (from the randomness of the dynamical matrix) and vibrational entropy. On the basis of this evidence, the boson peak must be a crossover from such a balance at higher frequencies to a mixture of sound waves and additional excitations at low frequency. | |
| dc.description | Letter, 4 pages, 4 figures, 24 references | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0407136 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0407136 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/24355 | |
| dc.subject | Disordered Systems and Neural Networks | |
| dc.title | Neutron scattering evidence on the nature of the boson peak | |
| dc.type | text |