Viscosity , ion mobility , and the A transition
نویسنده
چکیده
A model is presented of the A transition in superfluid helium in which fluctuations near the transition are approximated by distinct regions of normal fluid and superfluid. The macroscopic viscosity of such a medium is computed. The ion mobility is also computed, taking into account a region of normal fluid around the ion induced by electrostriction. The results are, for the viscosity, TJ, TJ t 06' and for the mobility p p, t 0.92, both in excellent agreement with recent experiments. The model suggests that the A transition itself is the point at which superfluid regions become macroscopically connected.
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