Connection between Boson Peak and Elastic Properties in Silicate Glasses

G. Baldi, A. Fontana, G. Monaco, L. Orsingher, S. Rols, F. Rossi, and B. Ruta
Phys. Rev. Lett. 102, 195502 – Published 13 May 2009

Abstract

Inelastic neutron, light, and x-ray scattering are used to investigate the vibrational density of states (VDOS) and the elastic properties of a sodium silicate glass as a function of temperature. The elastic moduli show the frequency and temperature dependence typical of anharmonic effects. The measured VDOS spectra, up to and including the excess vibrational density at the boson peak, scale with the Debye level only if this is calculated from the high-frequency values of the elastic constants. This emphasizes that conclusions on the relation between VDOS and elastic properties can be drawn only if anharmonic and relaxational effects are properly taken into account.

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  • Received 10 February 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.195502

©2009 American Physical Society

Authors & Affiliations

G. Baldi1,*, A. Fontana2,3, G. Monaco4, L. Orsingher2,3, S. Rols5, F. Rossi2,3, and B. Ruta4

  • 1INFM-CNR CRS-SOFT Operative Group in Grenoble c/o E.S.R.F., BP220, 38043 Grenoble, France
  • 2Physics Department, Trento University, 38050 Povo, Trento, Italy
  • 3INFM-CNR CRS-SOFT, c/o Roma University “La Sapienza,” 00185, Roma, Italy
  • 4European Synchrotron Radiation Facility, BP220, 38043 Grenoble, France
  • 5Institut Laue-Langevin, BP156, 38042 Grenoble, France

  • *giacomo.baldi@esrf.fr

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Vol. 102, Iss. 19 — 15 May 2009

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