Vortex dynamics in superfluid helium films

Journal Article · Wed Apr 01 04:00:00 EST 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.4633· OSTI ID:5893620

Adams, P W; Glaberson, W I

A high-Q torsional oscillator was used to measure the superfluid density and excess dissipation in thin films of /sup 4/He as a function of temperature and film thickness. The effects of rotation on the Kosterlitz-Thouless transition were studied and the rotation-induced dissipation was measured. The first direct measurements of vortex diffusivity D as a function of the temperature through the superfluid transition were obtained. We find that D is a rapidly varying function of temperature in the vicinity of the transition. It is very small well below the transition, increases to order h-dash-bar/m at the static transition temperature, and appears to diverge at the point where the superfluid density vanishes. The diffusivity also appears to be insensitive to the presence of /sup 3/He impurities and to the nature of the substrate.

• Research Organization: Serin Physics Laboratory, Rutgers University, Piscataway, New Jersey 08854
• OSTI ID: 5893620
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DENSITY
DIFFUSION
ENERGY LOSSES
EVEN-EVEN NUCLEI
FILMS
FLUIDS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
LOSSES
MOTION
NUCLEI
PHYSICAL PROPERTIES
QUANTUM FLUIDS
ROTATION
STABLE ISOTOPES
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION TEMPERATURE
VORTICES