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Hysteresis and Avalanche Behavior of Helium in Anopore and Nuclepore

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Abstract

Superfluid 4 He exhibits hysteretic behavior in the porous material Nuclepore due to capillary condensation, and one observes avalanches in the draining for a narrow range of chemical potential. We have demonstrated that the avalanche behavior involves pores distributed at a low density across the entire sample, and that avalanches are enabled by the superfluid film. We present results which compare the behavior of superfluid 4 He in Nuclepore to its behavior in Anopore, a porous membrane having no interconnected pores, and draw conclusions concerning the role of the superfluid film and the pore intersections.

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Wootters, A.H., Lilly, M.P. & Hallock, R.B. Hysteresis and Avalanche Behavior of Helium in Anopore and Nuclepore. Journal of Low Temperature Physics 110, 561–566 (1998). https://doi.org/10.1023/A:1022567102132

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  • DOI: https://doi.org/10.1023/A:1022567102132

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