THE CHARACTERISTIC RESPONSE CURVE, Y-DELTA-P), OF A HE-3 WEAK-LINK

We report measurements of the mass current as a function of pressure d ifference, I(DELTAP), for superfluid He-3 flowing through an aperture whose dimensions are on the order of the temperature dependent coheren ce length. The goal of the experiment is to see to what extent this we ak link behaves like a simple Josephson junction. A model has been dev eloped which predicts I(DELTAP) for the case where the weak link is an alyzed as a series connection of resistance, inductance and ideal Jose phson junction. This model is found to be inadequate to explain the ce ntral feature of the data, i.e. the current increases monotonically wi th DELTAP.