Hydrodynamic sound experiments in normal and superfluid /sup 3/He

Journal Article · Sun May 01 04:00:00 EDT 1983 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.27.5534· OSTI ID:5757541

Eska, G; Neumaier, K; Schoepe, W; Uhlig, K; Wiedemann, W

In a cylindrical resonator the attenuation and the velocity of first sound in normal and superfluid /sup 3/He have been measured in the frequency range from 40 to 300 kHz and at pressures of 8, 18.8, and 28 bar. In the normal fluid the viscosity deduced from our data agrees with previously reported values; the sound velocity in this regime can be explained by taking into account mean-free-path effects and zero-sound corrections. The results for the viscosity in the superfluid confirm the previous observations of a continuous decrease down to the lowest temperatures in contradiction to theoretical predictions. The sound-velocity data in the superfluid regime indicate that specular reflection of the quasiparticles may occur at the resonator walls.

• Research Organization: Zentralinstitut fuer Tieftemperaturforschung, D-8046 Garching, Federal Republic of Germany
• OSTI ID: 5757541
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 27:9; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATTENUATION
ELECTRONIC EQUIPMENT
EQUIPMENT
EVEN-ODD NUCLEI
FLUID FLOW
FREQUENCY RANGE
GAS FLOW
HELIUM 3
HELIUM ISOTOPES
ISOTOPES
KHZ RANGE
KHZ RANGE 01-100
KHZ RANGE 100-1000
LIGHT NUCLEI
MEDIUM PRESSURE
NUCLEI
REFLECTION
RESONATORS
SLIP FLOW
SOUND WAVES
STABLE ISOTOPES
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
VELOCITY
VISCOSITY
WALL EFFECTS