Collective nature of the boson peak and universal transboson dynamics of glasses

Using probe molecules with resonant nuclei and nuclear inelastic scattering, we are able to measure the density of states exclusively for collective motions with a correlation length of more than approximately 20 A. Such spectra exhibit an excess of low-energy modes (boson peak). This peak behaves i...

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Bibliographic Details
Published in:Physical review letters 2004-06, Vol.92 (24), p.245508.1-245508.4, Article 245508
Main Authors: CHUMAKOV, A. I, SERGUEEV, I, VAN BÜRCK, U, SCHIRMACHER, W, ASTHALTER, T, RÜFFER, R, LEUPOLD, O, PETRY, W
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Lattice dynamics
Physics
Vibrational states in disordered systems
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Summary:Using probe molecules with resonant nuclei and nuclear inelastic scattering, we are able to measure the density of states exclusively for collective motions with a correlation length of more than approximately 20 A. Such spectra exhibit an excess of low-energy modes (boson peak). This peak behaves in the same way as that observed by conventional methods. This shows that a significant part of the modes constituting the boson peak is of collective character. At energies above the boson peak, the reduced density of states of the collective motions universally exhibits an exponential decrease.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.92.245508