Observation of the Josephson plasma mode for a superfluid $^3$He weak link

Details Observation of the Josephson plasma mode for a superfluid $^3$He weak link Observation of the Josephson plasma mode for a superfluid $^3$He weak link

1999-10-07

arxiv.org/abs/cond-mat/9910120v1

Physics

Condensed Matter

Statistical Mechanics

Submitted to Phys. Rev. B. 9 pages, 3 figures

Scientific paper

10.1103/PhysRevB.61.4196

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 $\pi$. We also find that the low amplitude frequency is a direct measure of the weak link's critical current in quantitative agreement with theory.

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