Coherence-length effects on the nucleation of superfluid transitions in liquid-helium mixtures

Nucleation of transitions in liquid 3He-4He mixtures

“…*Only T ~ 0.9 K is treated in Ref. 27 and a different method of obtaining p, was used. Several numerical results, but no essential conclusions, are changed.…”

“…However, if we plot vs. e0 the calculated value of (26) at the experimental onset superfluidity temperature, we observe that the best fit is obtained in the temperature range between 0.2 and 0.7 K (see Fig. 12) by trs = 3 x 10-2(eo -1.12)3.6 x 10 -8 g/cm 2 (27) We observe that the experimental dependence is eo-1.12 instead of the expected one eo -ds = eo-1.5. However, this affects in no way the important experimental behavior observed, i.e., the linear eo dependence of trs.…”

Critical Casimir Effect near theH3e−H4Garcia1, Chan2 2002Phys. Rev. Lett.116211930View full textAdd to dashboardCite

“…The difference in behavior at the superfluid transition above and below X ϳ 0.6 is likely due to a change in the 4 He rich layer close to the substrate. This layer remains superfluid above the superfluid transition temperature of the bulk mixture for X * 0.6, but not for X & 0.6 [15,22]. For X * 0.6, this means the order parameter vanishes at the vapor interface but remains nonzero near the substrate.…”

“…The profiles are calculated using the numerical method of Ref. [15] and the concentration susceptibility data of Ref. [16] for an adsorbed film 500 Å thick and with the bulk liquid near the tricritical concentration.…”

Approach tq complete wetting in 4He-3He binary liquid mixtures

“…In a related previous study [3,27] one of us and co-workers have shown the existence of a superficial superfluid transition in the adsorbed 4He layer. It has been determined to be of the Kosterlitz-Thouless type i.e.…”