Thermodynamic theory of thin-filmHe3-He

Nucleation of transitions in liquid 3He-4He mixtures

“…12) allows one to obtain the concentration and pressure profiles in the vapor and liquid phases of the mixture, as represented in Fig. 1.…”

“…3, where we have plotted for each starting concentration xa the corresponding transition temperature T,(xa); "'... T~(xa) is defined as the higher temperature for which a solution P< Ps of Eq. (11) or (12) exists, P~ being the freezing pressure of the mixture (-25 atm around 1 K). This diagram illustrates strikingly the influence of walls on the nucleation of transitions: For a given concentration the onset wall superfluidity temperature is noticeably higher than the bulk transition temperature, except above 1.9 K, where the unfavorable pressure effect overcomes the rise of 4He concentration (see Fig.…”

Two-Dimensional Interface Excitations: Measurements inHe3-HeChester1, Webster2, Webster3 et al. 1980Phys. Rev. Lett.5030View full textAdd to dashboardCite

“…That H rises with /3 is also commensurate with other measurements on the compressed mass region. 5 ' 7 ' 9 The energy-gap value, r, may reflect the nature of the substrate via the van der Waals force which produces the compression at the substrate. The neutron scattering substrate, Graphon, is characterized by a van der Waals strength about three and a half times greater than that for our substrate.…”

Superfluid Fraction ofH3e−H4Kimball1, Gasparini2 2001Phys. Rev. Lett.17050View full textAdd to dashboardCite

“…This gradient in x is partly in a region where the superfluid is normal, even though rich in 4 He. This mechanism effectively limits the mixture to an L eff smaller than L. This effect can be estimated using a continuous model [29]. Irrespective of these refinements, it is clear that the finite-size scaling prediction based on the same geometrical confinement, but a changing j 0 ͑x͒, works well.…”