Effect of low-energy dynamics on anomalous vibrational amplitudes in vitreous silica

Mitsutaka Nakamura, Masatoshi Arai, Yasuhiro Inamura, Toshiya Otomo, and S. M. Bennington
Phys. Rev. B 66, 024203 – Published 26 June 2002
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Abstract

The role of low-energy dynamics in vitreous silica is discussed from the viewpoint of atomic motion. Coherent inelastic neutron scattering measurements have given the averaged mean-square displacements through an evaluation of Debye-Waller factor. The temperature dependences of the averaged mean-square displacements have been obtained in various types of SiO2. The averaged mean-square displacements of vitreous silica are significantly greater than those of other SiO2 samples at any temperatures. This finding is explained based on the distribution of double-well potentials, whose barriers are significantly small. The anisotropic and flexible atomic motions in vitreous silica should be realized for small barrier potentials, giving rise to an excess density of states around 5 meV, the so-called boson peak.

  • Received 14 November 2001

DOI:https://doi.org/10.1103/PhysRevB.66.024203

©2002 American Physical Society

Authors & Affiliations

Mitsutaka Nakamura*, Masatoshi Arai, Yasuhiro Inamura, and Toshiya Otomo

  • Neutron Science Laboratory, Institute of Materials Structure Science, KEK, 1-1 Oho, Tsukuba 305-0801, Japan

S. M. Bennington

  • ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom

  • *Present address: Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan.

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Vol. 66, Iss. 2 — 1 July 2002

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