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Collective Modes in Aerogels of Different Porosity Filled with Helium II

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Abstract

The velocities of fast and slow collective modes of superfluid He II in 90%, 94% and 98% porosity aerogels were measured by means of low-frequency resonant technique using piezoelectric transducers. The measured temperature dependences of velocities of both modes are compared with the theory based on approach of Biot (J. Acoust. Soc. Am. 28:168, 1956; J. Acoust. Soc. Am. 28:179, 1956) for porous medium filled with superfluid helium with taking into account of tortuosity of an acoustic way and porosity (Kekutia and Chkhaidze in Fiz. Nizk. Temp. 28:1115, 2002). The coefficients of tortuosity are obtained for the aerogel samples studied. Evolution of the fast and slow modes with the temperature and porosity variation is established.

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Authors and Affiliations

  1. Department of Quantum Fluids and Solids, B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Kharkov, 61103, Ukraine

    E. Y. Rudavskii, A. A. Zadorozhko, V. K. Chagovets & G. A. Sheshin

  2. Institute of Cybernetics, Georgian Academy of Sciences, Tbilisi, 380086, Georgia

    N. D. Chkhaidze & S. E. Kekutia

  3. Department of Physics and Astronomy, University of Delaware, Newark, DE, 19716, USA

    N. Mulders

Authors
  1. E. Y. Rudavskii
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  2. A. A. Zadorozhko
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  3. V. K. Chagovets
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  4. G. A. Sheshin
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  5. N. D. Chkhaidze
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  6. S. E. Kekutia
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  7. N. Mulders
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Corresponding author

Correspondence to A. A. Zadorozhko.

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Rudavskii, E.Y., Zadorozhko, A.A., Chagovets, V.K. et al. Collective Modes in Aerogels of Different Porosity Filled with Helium II. J Low Temp Phys 158, 256 (2010). https://doi.org/10.1007/s10909-009-0034-5

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  • DOI: https://doi.org/10.1007/s10909-009-0034-5

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