Near-monolayer /sup 3/He-/sup 4/He films: Two superfluid transitions and the /sup 3/He effective mass and binding energy

Journal Article · Thu Dec 01 04:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.11245· OSTI ID:6861157

Wang, X; Gasparini, F M

We have measured the mass loading on a torsional oscillator of mixture films of /sup 3/He and /sup 4/He at coverages near one active atomic layer of /sup 4/He. These measurements yield information about the superfluid transition of /sup 4/He and the effective mass and binding energy of /sup 3/He. Unlike the situation with submonolayer and multilayer films, where the superfluid transition takes place at a single temperature, we observe for these films a transition in two steps. This confirms a report some time ago of a similar observation by Bishop and Reppy. By comparing the mass loading at T = 0 of pure /sup 4/He films with that of mixtures, we obtain the /sup 3/He effective mass which can be compared with results from the specific heat. We find, in particular, that the effective mass has a maximum as a function of /sup 4/He thickness with correct asymptotic values for infinite and zero thickness limits. This maximum coincides very nearly with the thickness of /sup 4/He at which the transition into the superfluid state takes place in two steps. In the submonolayer region the effective mass agrees with a density dependence one might expect as an extension of the theory of Pandharipande and Itoh for three-dimensional mixtures. We believe such theory should be able to be done for the two-dimensional case.

• Research Organization: State University of New York at Buffalo, Buffalo, New York 14260
• OSTI ID: 6861157
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:16; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BINDING ENERGY
DATA
DISPERSIONS
ENERGY
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FILMS
HELIUM 3
HELIUM 4
HELIUM ISOTOPES
INFORMATION
ISOTOPES
LAYERS
LIGHT NUCLEI
MASS
MIXTURES
NUCLEI
NUMERICAL DATA
PHASE TRANSFORMATIONS
STABLE ISOTOPES
SUPERFLUIDITY