Elastic inhomogeneity and acoustic phonons in Pd-, Pt-, and Zr-based metallic glasses

T. Ichitsubo, W. Itaka, E. Matsubara, H. Kato, S. Biwa, S. Hosokawa, K. Matsuda, J. Saida, O. Haruyama, Yoshihiko Yokoyama, H. Uchiyama, A. Q.R. Baron

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Abstract

We have investigated acoustic-phonon behavior of Pd-, Pt-, and Zr-based metallic glasses with the combination of inelastic x-ray scattering and ultrasonic (US) measurements. In the dispersion of the longitudinal acoustic modes at small wave number Q, the phase velocity of phonon tends to exceed the US velocity with a wavelength of macroscopic scale for Pd- and Pt-based glasses, whereas the former goes close to the latter for Zr-based glasses. Furthermore, in all the cases, the mean free path L of phonon apparently increases steeply at a certain Q value. These phenomena on the acoustic phonon behavior can be qualitatively explained by the elastic-wave-scattering theory with a simple two-phase model.

Original languageEnglish
Article number172201
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number17
DOIs
Publication statusPublished - 2010 May 3

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Ichitsubo, T., Itaka, W., Matsubara, E., Kato, H., Biwa, S., Hosokawa, S., Matsuda, K., Saida, J., Haruyama, O., Yokoyama, Y., Uchiyama, H., & Baron, A. Q. R. (2010). Elastic inhomogeneity and acoustic phonons in Pd-, Pt-, and Zr-based metallic glasses. Physical Review B - Condensed Matter and Materials Physics, 81(17), [172201]. https://doi.org/10.1103/PhysRevB.81.172201