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Thermal conductivity study of thin He films adsorbed in porous glasses with well controlled pore sizes

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Abstract

Thermal conductivity study of thin He films adsorbed in porous glasses with well controlled pore sizes[2] is reported. The measurements are performed in a cell where a torsional oscillator monitors the superfluid density change, for the same films for comparison. Since the heat flux through the superfluid is proportional to the superfluid velocity, we discuss the possible observation of the intrinsic critical velocity vsl = h/ml, inherent in superfluid He films in such porous systems with unit pore length l, as discussed by Minoguchi and Nagaoka[3], which marks the velocity at which phase slippages start to occur over macroscopic scales.

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Authors and Affiliations

  1. Institute for Solid State Physics, University of Tokyo, Roppongi 7-22-1, Minato-ku, 106, Tokyo, Japan

    M. Kubota, T. Iida, G. Ueno, V. Kovacik, M. Fukuda, T. Yano & M. Zalalutdinov

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  1. M. Kubota
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  2. T. Iida
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  3. G. Ueno
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  4. V. Kovacik
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  5. M. Fukuda
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  6. T. Yano
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  7. M. Zalalutdinov
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on leave from: Inst. Physics near Praha

on leave from: Lukin's Research Inst. Phys. Problems, Zelnograd, Moscow.

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Kubota, M., Iida, T., Ueno, G. et al. Thermal conductivity study of thin He films adsorbed in porous glasses with well controlled pore sizes. J Low Temp Phys 101, 265–270 (1995). https://doi.org/10.1007/BF00754587

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