Phys. Rev. Lett. 53, 2316–2319 (1984)Neutron Scattering Study of the Low-Frequency Vibrations in Vitreous SilicaSee Also: Erratum Received 23 July 1984; published in the issue dated 10 December 1984 The vibrational excitations in vitreous silica above 150 GHz were investigated at 50, 100, and 290 K by inelastic scattering of cold neutrons. A detailed study of the frequency and wave-vector dependence shows that even at the lowest frequencies only a small part of the scattering is due to acoustic phonons. The type of motion of the dominating additional low-frequency modes is identified as a coupled rotation of SiO4 tetrahedra. Possible connections to the low-temperature glass anomalies are discussed. © 1984 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.53.2316
DOI:
10.1103/PhysRevLett.53.2316
PACS:
63.50.+x, 63.20.Dj, 65.40.Em
See AlsoComment: Ulrich Strom, Low-Frequency Vibrational Modes and the Far-Infrared Dielectric Loss in Glasses, Phys. Rev. Lett. 56, 2110 (1986). Erratum: U. Buchenau, N. Nücker, and A. J. Dianoux, Neutron Scattering Study of the Low-Frequency Vibrations in Vitreous Silica, Phys. Rev. Lett. 56, 539 (1986). |
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