Structural and dynamic origin of the boson peak in a Cu-Zr metallic glass. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2012

Structural and dynamic origin of the boson peak in a Cu-Zr metallic glass.

Résumé

Using molecular dynamics simulations, we studied the short-time dynamics of the amorphous Cu50Zr50 alloy. We determined the occurrence of a well-defined boson peak in agreement with experimental observations. Our results indicate that the structural origin of the boson peak can be related to Cu and Zr atoms having large mean-square amplitudes in low-density defective local structures. Moreover, we show that these structural motifs display quasilocalized modes that resonantly couple with transverse phonons, leading to the accumulation of the low-energy modes around the boson peak. Finally, the correlation between the attenuation of sound and the boson peak is discussed.

Domaines

Matériaux
Fichier non déposé

Dates et versions

hal-00728137 , version 1 (04-09-2012)

Identifiants

Citer

N. Jakse, A. Nassour, A. Pasturel. Structural and dynamic origin of the boson peak in a Cu-Zr metallic glass.. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2012, 85 (17), pp.1. ⟨10.1103/PhysRevB.85.174201⟩. ⟨hal-00728137⟩
37 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More