Persistent currents and critical velocities in /sup 3/He--/sup 4/He mixtures

Journal Article · Sun Aug 01 04:00:00 EDT 1976 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00655270· OSTI ID:7147554

Carey, R; Pobell, F

Using the method of Doppler-shifted fourth sound, an investigation is made of the angular velocity omega/sub c1/ for the onset of vorticity, the saturated critical velocity, and the dependence of rho/sub s//rho on v/sub n/--v/sub s/ for /sup 4/He in three different pore sizes and for three different mixtures of /sup 3/He-/sup 4/He in one of the powders used. These are the first measurements of critical velocities in /sup 3/He-/sup 4/He mixtures. A weak dependence of ..omega../sub c1/ on the pore size and within the limits of the experiment no dependence on concentration X up to X = 0.11 is observed. It is found, however, that the maximum v/sub n/-v/sub s/ attainable increases as the concentration of /sup 3/He increases for X less than or equal to 0.17. The observed dependence of the superfluid density on v/sub n/-v/sub s/ is approximately two orders of magnitude stronger than predicted.

• Research Organization: Kernforschunganlage, Juelich, Ger.
• OSTI ID: 7147554
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 24:3/4; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CURRENTS
DENSITY
DISPERSIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FOURTH SOUND
HELIUM 3
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MIXTURES
NUCLEI
PHYSICAL PROPERTIES
STABLE ISOTOPES
SUPERFLUIDITY
VELOCITY