Affiliation:
1. Physics Department, University of California, Berkeley, CA 94720, USA.
Abstract
Direct measurements of the current-phase relation,
I
versus Δφ, for a weak link coupling two reservoirs of B-phase superfluid helium-3 (
3
He-B) were made over a wide range of temperatures. The weak link consists of a square array of 100-nanometer-diameter apertures. For temperatures
T
such that
T
/
T
c
≥ 0.6 (where
T
c
is the superfluid transition temperature),
I
∝ sin(Δφ). At lower temperatures,
I
(Δφ) approaches a straight line. Several remarkable phenomena heretofore inaccessible to superconducting Josephson junctions, including direct observation of quantum oscillations and continuous knowledge of Δφ, were also observed.
Publisher
American Association for the Advancement of Science (AAAS)
Reference24 articles.
1. B. D. Josephson thesis Trinity College Cambridge University (1962)
2. P. W. Anderson in Lectures on the Many-Body Problem E. R. Caianello Ed. (Academic Press New York 1964) p. 113-135
3. R. P. Feynman The Feynman Lectures on Physics (Addison-Wesley New York 1965) sect. 21-9.
4. In contrast the superfluid 4 He healing length is ≈0.1 nm. Because apertures of this diameter are not presently available it is quite challenging to search for these phenomena in superfluid 4 He.
5. J. Steinhauer thesis University of California Berkeley (1995).
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