Direct Measurement of the Current-Phase Relation of a Superfluid 3He-B Weak Link

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Science  21 Nov 1997:
Vol. 278, Issue 5342, pp. 1435-1438
DOI: 10.1126/science.278.5342.1435

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Direct measurements of the current-phase relation, Iversus Δφ, 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/T c ≥ 0.6 (whereT 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.

  • * Permanent address: Institute for High Pressure Physics, Russian Academy of Sciences, Moscow, Russia.

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