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Acoustic Properties of Normal Liquid 3He in 98% Aerogel

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Abstract

We have performed longitudinal ultrasound (9.5 MHz) attenuation and sound velocity measurements in the normal state of liquid 3He in 98% aerogel. The absolute attenuation and sound velocity were determined by direct propagation of sound pulses through the medium in a wide range of temperatures, 2 mK<T<200 mK. Due to the scattering off the aerogel, the sound excitation remains as first sound over the entire range of temperatures and pressures studied. Unlike pure liquid 3He, the sound attenuation shows a minimum around 30–50 mK, depending on the pressure. We report our results of absolute sound attenuation measurements at 29 bars of sample pressure.

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Authors and Affiliations

  1. Microkelvin Laboratory, Department of Physics, University of Florida, Gainesville, FL, 32611-8440, USA

    H. C. Choi, N. Masuhara, B. H. Moon, P. Bhupathi, M. W. Meisel & Y. Lee

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

    N. Mulders

Authors
  1. H. C. Choi
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  2. N. Masuhara
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  3. B. H. Moon
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  4. P. Bhupathi
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  5. N. Mulders
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  6. M. W. Meisel
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  7. Y. Lee
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Correspondence to H. C. Choi.

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Choi, H.C., Masuhara, N., Moon, B.H. et al. Acoustic Properties of Normal Liquid 3He in 98% Aerogel. J Low Temp Phys 148, 609–613 (2007). https://doi.org/10.1007/s10909-007-9490-y

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  • DOI: https://doi.org/10.1007/s10909-007-9490-y

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