Healing length near the lambda point in liquid helium

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.6527· OSTI ID:6190140

Lea, M J; Spencer, D S; Fozooni, P

Viscous shear waves have been used to probe the spatial variation and healing of the viscosity and superfluid density near a solid wall in bulk He I, bulk He II, and in saturated superfluid films with thicknesses from 14 to 24 nm. The shear waves were generated at 20 and 34 MHz with an AT-cut quartz crystal resonator, and the transverse-acoustic impedance of the helium was measured at temperatures T close to the lambda point at T/sub lambda/. In bulk He II the results confirm a previous measurement of the healing length a(T) = (0.094 +- 0.002)epsilon/sup -2/3/ nm, where epsilon = chemically bond1-T/T/sub lambda/chemically bond. In bulk He I the measurements suggest that the viscosity exhibits healing above T/sub lambda/ near a solid wall with a similar healing length as in He II. Healing effects were observed below the superfluid transition temperature in the films and are also described by the same healing length as in the bulk liquid.

• Research Organization: Department of Physics, Royal Holloway and Bedford New College, University of London, Egham, Surrey, TW20chemically bond0EX, England
• OSTI ID: 6190140
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOUNDARY-VALUE PROBLEMS
DENSITY
DISTRIBUTION
EVEN-EVEN NUCLEI
FLUIDS
HELIUM 4
HELIUM I
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LAMBDA POINT
LIGHT NUCLEI
NUCLEI
PHYSICAL PROPERTIES
PROBES
QUANTUM FLUIDS
SPATIAL DISTRIBUTION
STABLE ISOTOPES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VISCOSITY
WALL EFFECTS