Search for an ac Josephson effect in superfluid /sup 4/He using a low-frequency acoustic resonator

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

DOI:https://doi.org/10.1103/PhysRevB.35.74· OSTI ID:6813040

Beecken, B P; Zimmermann, W Jr

A search for a Josephson effect in superfluid /sup 4/He has been carried out with use of a low-frequency acoustic resonator in analogy to an rf-biased superconducting quantum interference device. Orifices from 100 to 400 nm in diameter in free-standing foils --100 nm thick were used as weak links. Observations were made at temperatures from 0.4 to 1.1 K and at pressures from 13 to 40 kPa. Aside from the suggestive behavior seen in one early run, no sign of a Josephson effect has been observed. Values of the order-parameter phase difference through the weak link at the critical rate of flow ranged from 9 x 2..pi.. to 33 x 2..pi.. rad at T = 0.95 K.

• Research Organization: Tate Laboratory of Physics, University of Minnesota, Minneapolis, Minnesota 55455
• OSTI ID: 6813040
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:1; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
EVEN-EVEN NUCLEI
FLUIDS
FOILS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
JOSEPHSON EFFECT
LIGHT NUCLEI
LOW PRESSURE
NUCLEI
OPENINGS
ORIFICES
QUANTUM FLUIDS
STABLE ISOTOPES
SUPERFLUIDITY
ULTRALOW TEMPERATURE