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Anomalous elastic properties of quench-condensed hydrogen films

  • Cryo-crystals
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Czechoslovak Journal of Physics Aims and scope

Abstract

Quench-condensed films of molecular hydrogen (H2, HD, and D2), prepared around 1 K, undergo a strong structural rearrangement upon annealing at 3–4 K. Caused by dewetting the film transforms into crystallites with sizes of the order of μm. Surface acoustic waves couple resonantly to the eigenmodes of these crystallites and are strongly scattered. The systematic variation with time of sound velocity and attenuation allows to trace the evolution of the crystallites. Moreover, at any stage of evolution a drastic temperature dependence of sound velocity and attenuation is observed between 0.1 K and 3 K. This has to be attributed to a strong change of the effective eigenfrequencies of the crystallites which cannot be readily explained by the bulk properties of hydrogen.

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Authors and Affiliations

  1. Physikalisches Institut, Universität Karlsruhe, D-76128, Karlsruhe, Germany

    Georg Weiss & Klaus Eschenröder

  2. Institut für Angewandte Physik, Universität Heidelberg, D-69120, Heidelberg, Germany

    Johannes Classen

Authors
  1. Georg Weiss
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  2. Klaus Eschenröder
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  3. Johannes Classen
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Weiss, G., Eschenröder, K. & Classen, J. Anomalous elastic properties of quench-condensed hydrogen films. Czech J Phys 46 (Suppl 1), 527–528 (1996). https://doi.org/10.1007/BF02569679

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  • DOI: https://doi.org/10.1007/BF02569679

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