Phys. Rev. B 61, 4196–4199 (2000)Observation of the Josephson plasma mode for a superfluid 3He weak linkReceived 10 September 1999; published in the issue dated 1 February 2000 The quantum phase difference across a superfluid Josephson-like weak link may exhibit periodic motion describable by a nonlinear equation identical to that of a rigid pendulum. We have directly observed this mode and find that the phase oscillation frequency decreases toward zero as the phase amplitude increases toward π. We also find that the low amplitude frequency is a direct measure of the weak link’s critical current in quantitative agreement with theory. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.4196
DOI:
10.1103/PhysRevB.61.4196
PACS:
67.57.-z, 74.50.+r
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