High Frequency dynamics in metallic glasses

Abstract

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.

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

References in corpus (6)

• Microscopic dynamics in liquid metals: the experimental point of view
• Is the Fragility of a Liquid Embedded in the Properties of its Glass?
• Glass-specific behavior in the damping of acoustic-like vibrations
• Relaxation processes in harmonic glasses?
• High frequency dynamics in a monatomic glass
• Evidence of short time dynamical correlations in simple liquids

Cited by in corpus (11)

• The Boson Peak and its Relation with Acoustic Attenuation in Glasses
• Correlation between Fragility and the Arrhenius Crossover Phenomenon in Metallic, Molecular, and Network Liquids
• Heat transport in model jammed solids
• Sound attenuation in stable glasses
• Localization-delocalization transition for disordered cubic harmonic lattices
• Excitation of vibrational soft modes in disordered systems using active oscillation
• An atomic mechanism for the boson peak in metallic glasses
• A thermodynamic treatment of the glass transition
• Study of the localization-delocalization transition for phonons via transfer matrix method techniques
• Microscopic Structural and Dynamical Properties of Amorphous Metallic Alloy $N{i}_{33}Z{r}_{67}$ at the Temperature $T=300K$
• Structural Origin of Boson Peak in Glasses