Collision Drag Effect on Propagation of Sound in Liquid<sup>3</sup>He in Aerogel

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  • Ichikawa Takayuki
    Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-hiroshima 739-8521
  • Yamamoto Mikio
    Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-hiroshima 739-8521
  • Higashitani Seiji
    Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-hiroshima 739-8521
  • Nagai Katsuhiko
    Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-hiroshima 739-8521

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  • Collision Drag Effect on Propagation of Sound in Liquid 3He in Aerogel.

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Sound propagation in a Fermi liquid with impurities is studied using the Landau-Boltzmann equation and the result is compared with that of a recent experiment in liquid 3He in aerogel by the Northwestern University group. The sound absorption calculated using a fixed impurity model is a few orders of magnitude larger than the experimental value. We take into account the simultaneous motion of aerogel molecules and propose a model in which the momentum loss of 3He quasi-particles during collisions with the aerogel is converted to a drag force that acts on the aerogel molecules. This collision drag model provides a reasonable description for the temperature and the pressure dependence of the observed sound velocity and absorption.

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