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Possible Sound Mode Conversion in “Superfluid 4He-97% Open Aerogel” System

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Abstract

We have studied the acoustic properties of liquid helium filled in various aerogels. The longitudinal ultrasound velocity and attenuation were measured at the frequency of 10 MHz with aerogels that had porosity from 92 to 97%. The mode intermediate between first and fourth sound was observed. The attenuation of this mode decreased with decreasing temperature for dense aerogels. However, an attenuation maximum was observed around 1.6 K for 97% open aerogel at various liquid pressures. In the present work, we discuss the possibility of the sound modes conversion between first, second sound in superfluid and aerogel sound mode in this composite system.

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Authors and Affiliations

  1. Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan

    Koichi Matsumoto, Hiroyuki Tsuboya, Keiichi Yoshino, Satoshi Abe & Haruhiko Suzuki

  2. Physics Department, Kazan State University, Kazan, 420008, Russia

    Dmitrii Tayurskii

Authors
  1. Koichi Matsumoto
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  2. Hiroyuki Tsuboya
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  3. Keiichi Yoshino
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  4. Satoshi Abe
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  5. Haruhiko Suzuki
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  6. Dmitrii Tayurskii
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Correspondence to Koichi Matsumoto.

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Matsumoto, K., Tsuboya, H., Yoshino, K. et al. Possible Sound Mode Conversion in “Superfluid 4He-97% Open Aerogel” System. J Low Temp Phys 148, 615–620 (2007). https://doi.org/10.1007/s10909-007-9465-z

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  • DOI: https://doi.org/10.1007/s10909-007-9465-z

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