³He-⁴He Mixtures in 95% Porous Aerogel

ISSN： 0022-2291

Source： Journal of Low Temperature Physics, Vol.110, Iss.1-2, 1998-01, pp. : 585-590

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Abstract

Torsional oscillator measurements of ³He-⁴He mixtures in 95% porous aerogel found a phase diagram similar to that in 98% porous aerogel. The coexistence boundary on the ³He rich side resides very close to, but nevertheless is detached from the superfluid transition line. Together with the findings in 98%, 87%, and 99.5% porous aerogel, this result supports the interpretation that the phase separation of ³He-⁴He mixture in aerogel is induced by the capillary condensation of ⁴ He films from neighboring silica strands into ⁴ He rich domains.

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