High Frequency dynamics in metallic glasses

Details High Frequency dynamics in metallic glasses High Frequency dynamics in metallic glasses

2006-03-09

arxiv.org/abs/cond-mat/0603251v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 4 .eps figures, accepted in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.135501

Using Inelastic X-ray Scattering we studied the collective dynamics of the glassy alloy Ni$_{33}$Zr$_{67}$ in the first pseudo Brillouin zone, an energy-momentum region still unexplored in metallic glasses. We determine key properties such as the momentum transfer dependence of the sound velocity and of the acoustic damping, discussing the results in the general context of recently proposed pictures for acoustic dynamics in glasses. Specifically, we demonstrate the existence in this strong glass of well defined (in the Ioffe Regel sense) acoustic-like excitations well above the Boson Peak energy.

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