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VOLUME 25 (1977) | ISSUE 3 | PAGE 168
Temperature dependence of the mutual friction force in helium near the point
The temperature dependence of the mutual friction force between the normal and superfluid parts of rotating superfluid helium in the critical region near the λ point is explained on the basis of the hypothesis of dynamic scale invariance. It is shown that the coefficients В and B' in the friction force increase like (ΔΓ)~(2_α)/6, where a is the critical exponent of the heat capacity; this agrees with the experimental data.