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Investigation of Ultrasound Attenuation in Impurity-Helium Solids Containing Liquid Helium

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Abstract

The attenuation of ultrasound in Impurity-Helium (Im-He) solids created upon introduction of impurity atoms or molecules (D 2 , N 2 , Kr) into a volume of superfluid helium has been investigated. The observed features of attenuation show that a porous substance consisting of a loosely interconnected continuous network is created in superfluid helium. This network is formed by impurity particles encapsulated in solidified helium. Analysis of attenuation allows us to conclude that Im-He solid samples have a wide distribution of pores from 8 nm to 800 nm. It was established that the character of attenuation in D 2 -He samples is considerably different from that in heavier Im-He solids, for which two maxima of attenuation were sometimes observed. A sharp peak was observed at Tc0 very close to the bulk helium lambda transition temperature and a second broad peak occurred at Tc<Tc0 . This behavior is similar to that predicted theoretically for liquid helium in restricted fractal porous media.

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Authors and Affiliations

  1. Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY, 14853, USA

    S. I. Kiselev, V. V. Khmelenko & D. M. Lee

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  1. S. I. Kiselev
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  2. V. V. Khmelenko
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  3. D. M. Lee
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Kiselev, S.I., Khmelenko, V.V. & Lee, D.M. Investigation of Ultrasound Attenuation in Impurity-Helium Solids Containing Liquid Helium. Journal of Low Temperature Physics 121, 671–676 (2000). https://doi.org/10.1023/A:1017588116477

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