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• W2052207132 abstract "Low-frequency Raman spectra of metaphosphate glasses (${mathrm{Sm}}_{2}$${mathrm{O}}_{3}$${)}_{mathit{x}}$(${mathrm{P}}_{2}$${mathrm{O}}_{5}$${)}_{1mathrm{ensuremath{-}}mathit{x}}$, (${mathrm{Eu}}_{2}$${mathrm{O}}_{3}$${)}_{mathit{x}}$(${mathrm{P}}_{2}$${mathrm{O}}_{5}$${)}_{1mathrm{ensuremath{-}}mathit{x}}$, (${mathrm{Gd}}_{2}$${mathrm{O}}_{3}$${)}_{mathit{x}}$(${mathrm{P}}_{2}$${mathrm{O}}_{5}$${)}_{1mathrm{ensuremath{-}}mathit{x}}$, and ${mathrm{GeO}}_{2}$ have been measured in a wide temperature range from Tensuremath{approxeq}10 K to the respective glass transition temperatures Tensuremath{approxeq}1000 K. Analysis of the Raman data in comparison with complementary low-temperature specific heat, and ultrasonic measurements reveals that the temperature and frequency dependences of the quasielastic scattering and boson peak, as well as anomalous low-temperature specific heat, are in qualitative agreement with the predictions of soft potential model (SPM). In the case of the spectral density of ``excess'' soft modes, which are assumed to coexist and interact with ordinary phonons, the agreement can even be made quantitative under the restricted assumptions that the low-frequency Raman scattering reflects the total (phonon + excess) density of states, and the photon-vibration coupling constant is approximately linearly dependent upon frequency. However neither of these assumptions are compatible with recent formulations of SPM." @default.
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• W2052207132 date "1995-10-01" @default.
• W2052207132 modified "2023-10-03" @default.
• W2052207132 title "Excess of low-energy excitations in glasses" @default.
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• W2052207132 doi "https://doi.org/10.1103/physrevb.52.9342" @default.
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