Capillary Condensation of Phase Separated Liquid ³He-⁴He Mixtures in Aerogel

ISSN： 0022-2291

Source： Journal of Low Temperature Physics, Vol.110, Iss.1-2, 1998-01, pp. : 591-596

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Abstract

We have studied details of the phase separation of ³He-⁴He mixtures in aerogel for ⁴He concentrations between 13 - 36% and at pressures of 0 and 22 bar. Simultaneous measurements of the ⁴He concentration (measured with a parallel-plate capacitor) and of the tortuosity of the ⁴He-rich phase (using the period of the torsional oscillator) provide evidence for the diversity of configurations of the ³He-⁴He interface as a consequence of capillary condensation. Thus, for the same ⁴He content within the aerogel, the ⁴He-rich phase can have different interconnectivities determined by preparation history.

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