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Very-low-frequency light scattering in silica at low temperatures
Phys. Rev. B 26, 7123(R) – Published 15 December, 1982
DOI: https://doi.org/10.1103/PhysRevB.26.7123
Abstract
We report a study of the light scattered at low-frequency shifts (0.03-20 ) in a silica-core glass fiber at temperatures as low as 1.46 K. Although our data agree in regions of spectral overlap with those reported previously, they provide a more detailed examination extending down to ∼0.03 (including the Brillouin spectrum). Contrary to extrapolations by earlier workers based on higher-frequency data, we find no evidence of a central component due to scattering from two-level tunneling systems.
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