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Observation of Superfluid 4He Adsorbed in One-Dimensional Mesopores

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Abstract

To study one-dimensional (1D) quantum liquid of 4 He, we measured the heat capacity and performed a torsional oscillator experiment for 4 He adsorbed on a new mesoporous substrate whose adsorption area consists of walls of straight one-dimensional 18Å diameter tunnels. The presence of adsorbed quantum liquid was examined by the isotope effect on the heat capacity for 3 He and 4 He adatoms. Above a coverage n o , the heat capacity isotherms are completely different because of the Fermi and the Bose fluids, respectively. In the torsional oscillator experiment we observed superfluid 4 He above n o . The fraction of the superfluid decoupled from the motion of the substrate is 0.13, which is the same order as 0.18 for packed Pt fine powder and 0.24 for 80 Å-porous glasses. The result indicates that the superfluid state exists in the one-dimensional 4 He adatoms formed in the 18 Å diameter pores.

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Authors and Affiliations

  1. Institute of Physics, Basic Science, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Meguro-ku, Tokyo, 153, Japan

    H. Yano, S. Yoshizaki, S. Inagaki, Y. Fukushima & N. Wada

  2. Toyota Central R&D Labs., Inc, Yokomichi, Nagakute, Aichi, 480-11, Japan

    S. Inagaki & Y. Fukushima

Authors
  1. H. Yano
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  2. S. Yoshizaki
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  3. S. Inagaki
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  4. Y. Fukushima
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  5. N. Wada
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Yano, H., Yoshizaki, S., Inagaki, S. et al. Observation of Superfluid 4He Adsorbed in One-Dimensional Mesopores. Journal of Low Temperature Physics 110, 573–578 (1998). https://doi.org/10.1023/A:1022571203040

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  • DOI: https://doi.org/10.1023/A:1022571203040

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