title: Direct measurement of the current-phase relation of a superfluid 3He-B weak link
abstract: Direct measurements of the current-phase relation, I versus Deltaphi, for a weak link coupling two reservoirs of B-phase superfluid helium-3 (3He-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/Tc >/= 0.6 (where Tc is the superfluid transition temperature), I approximately sin(Deltaphi). At lower temperatures, I(Deltaphi) approaches a straight line. Several remarkable phenomena heretofore inaccessible to superconducting Josephson junctions, including direct observation of quantum oscillations and continuous knowledge of Deltaphi, were also observed.
authors.affiliation: Physics Department, University of California, Berkeley, CA 94720, USA.
authors.initials: S
authors.lastname: Backhaus
authors.initials: SV
authors.lastname: Pereverzev
authors.initials: A
authors.lastname: Loshak
authors.initials: JC
authors.lastname: Davis
authors.initials: RE
authors.lastname: Packard