Capillary condensation of phase separated liquid 3He-4He mixtures in aerogel

We have studied details of the phase separation of He-3-He-4 mixtures in aerogel for He-4 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 He-4-rich phase (using the period of the torsional oscillator) provide evidence for the diversity of configurations of the He-3-He-4 interface as a consequence of capillary condensation. Thus, for the same He-4 content within the aerogel, the He-4-rich phase can have different interconnectivities determined by preparation history.