Neutron scattering evidence on the nature of the boson peak

Details Neutron scattering evidence on the nature of the boson peak Neutron scattering evidence on the nature of the boson peak

2004-07-06

arxiv.org/abs/cond-mat/0407136v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

Letter, 4 pages, 4 figures, 24 references

Scientific paper

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.

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