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Influence of Adsorption Potential on 3He Fluid States Formed on 4He-Preplated Substrates

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From heat capacity measurements for 3He adsorbed on 4He-preplated mesopore in substrates, FSM-16, HMM-2, and Hectorite, we found fluid states of the 3He adatoms. At very dilute 3He densities, however, it strongly depends on the substrate whether the adatoms are in a localized or a fluid state. The molar heat capacity of a two-dimensional gas or a degenerate Fermi fluid appears above densities nc = 0, 0, and 2 μmol/m2 for FSM-16, HMM-2, and Hectorite, respectively. The critical coverages nc are extremely small or zero for the former two SiO2-based substrates. On the other hand, nc for Hectorite is large. Since Hectorite has strong adsorption sites due to the electric-dipole field gradients around ions located on the substrate surface, these potentials are likely to affect the localization of the dilute 3He adsorbed even on the 4He film.

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Authors and Affiliations

  1. Department of Physics, Graduate School of Science, Nagoya University, Chikusa-ku, 464-8602, Nagoya, Japan

    Taku Matsushita, Ryo Toda & Nobuo Wada

  2. Department of Applied Physics and Chemistry, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, 182-8585, Tokyo, Japan

    Junko Taniguchi

  3. Low Temperature Physics Laboratory, Discovery Research Institute, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, 351-0198, Saitama, Japan

    Hiroki Ikegami

Authors
  1. Taku Matsushita
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  2. Ryo Toda
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  3. Junko Taniguchi
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  4. Hiroki Ikegami
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  5. Nobuo Wada
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Additional information

PACS numbers: 67.55.Cx, 67.70+n, 71.30+h

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Matsushita, T., Toda, R., Taniguchi, J. et al. Influence of Adsorption Potential on 3He Fluid States Formed on 4He-Preplated Substrates. J Low Temp Phys 138, 289–294 (2005). https://doi.org/10.1007/s10909-005-1565-z

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  • DOI: https://doi.org/10.1007/s10909-005-1565-z

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