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@ARTICLE{Buchenau:1002037,
      author       = {Buchenau, U. and D’Angelo, G. and Carini, G. and Liu, X.
                      and Ramos, M. A.},
      title        = {{S}ound absorption in glasses},
      journal      = {Reviews in physics},
      volume       = {9},
      issn         = {2405-4283},
      address      = {Amsterdam},
      publisher    = {Elsevier},
      reportid     = {FZJ-2023-01235},
      pages        = {100078 -},
      year         = {2022},
      abstract     = {The paper presents a description of the sound wave
                      absorption in glasses, from the lowest temperatures up to
                      the glass transition, in terms of three compatible
                      phenomenological models. Resonant tunneling, the rise of the
                      relaxational tunneling to the tunneling plateau and the
                      crossover to classical relaxation are universal features of
                      glasses and are well described by the tunneling model and
                      its extension to include soft vibrations and low barrier
                      relaxations, the soft potential model. Its further extension
                      to non-universal features at higher temperatures is the very
                      flexible Gilroy–Phillips model, which allows to determine
                      the barrier density of the energy landscape of the specific
                      glass from the frequency and temperature dependence of the
                      sound wave absorption in the classical relaxation domain. To
                      apply it properly at elevated temperatures, one needs its
                      formulation in terms of the shear compliance. As one
                      approaches the glass transition, universality sets in again
                      with an exponential rise of the barrier density reflecting
                      the frozen fast Kohlrausch -tail (in time , with close to
                      1/2) of the viscous flow at the glass temperature. The
                      validity of the scheme is checked for literature data of
                      several glasses and polymers with and without secondary
                      relaxation peaks. The frozen Kohlrausch tail of the
                      mechanical relaxation shows no indication of the strongly
                      temperature-dependent barrier density observed in dielectric
                      data of molecular glasses with hydrogen bonds. Instead, the
                      mechanical relaxation data indicate an energy landscape
                      describable with a frozen temperature-independent barrier
                      density for any glass.},
      cin          = {JCNS-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {899 - ohne Topic (POF4-899)},
      pid          = {G:(DE-HGF)POF4-899},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.revip.2022.100078},
      url          = {https://juser.fz-juelich.de/record/1002037},
}