Variation of the critical order-parameter phase difference with temperature from 0. 4 to 1. 9 K in the flow of superfluid /sup 4/He through a tiny orifice

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

DOI:https://doi.org/10.1103/PhysRevB.35.1630· OSTI ID:6925205

Beecken, B P; Jr, Zimmermann W

The temperature dependence of the order-parameter phase difference at the critical rate of flow of superfluid /sup 4/He through a tiny orifice has been studied between 0.4 and 1.9 K. Use was made of a low-frequency two-chamber acoustic resonator at frequencies between 400 and 2900 Hz. The orifice consisted of a hole --170 nm in diameter in a free-standing foil --100 nm thick. The critical phase difference was found in four runs to equal 31 x 2..pi.. rad and in two later runs to equal 16 x 2..pi.. rad at 0.95 K. In all cases the critical phase difference decreased linearly with increasing temperature between 0.4 and 1.9 K. The lines which fit the data extrapolate to zero at 2.45 +- 0.1 K.

• Research Organization: Tate Laboratory of Physics, University of Minnesota, Minneapolis, Minnesota 55455
• OSTI ID: 6925205
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:4; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACOUSTIC MEASUREMENTS
CAPILLARY FLOW
DATA
ELECTRONIC EQUIPMENT
EQUIPMENT
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FLUID FLOW
FLUIDS
FREQUENCY RANGE
HELIUM 4
HELIUM II
HELIUM ISOTOPES
HZ RANGE
INFORMATION
ISOTOPES
KHZ RANGE
KHZ RANGE 01-100
LIGHT NUCLEI
NUCLEI
NUMERICAL DATA
OPENINGS
ORDER PARAMETERS
ORIFICES
PHASE STUDIES
QUANTUM FLUIDS
RESONATORS
STABLE ISOTOPES
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE