Focuses on the superfluid phase of 3He in aerogel at nonzero pressure, indicating a unique critical density requirement.
We present evidence for a nonzero pressure, T 0 superfluid phase transition of 3He in 98.2% open aerogel. Unlike bulk 3He which is a superfluid at T 0 at all pressures (densities) between zero and the melting pressure, 3He in aerogel is not superfluid unless the 3He density exceeds a critical value rc. About 90% of the 3He added above rc contributes to the superfluid density. [S0031-9007(97)03585-0]
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松本 et al. (1997) studied this question.
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