Abstract:
Measurements of the thermal response, ΔT(ω), across a layer of helium in its normal and superfluid phases have been made for an AC heat source, Q(t)=Qoexp(iωt). Previous DC measurements below Tλhave indicated a dependence on the layer thickness, d, for κeffat low concentrations, X, suggesting an intrinsic length scale within the fluid. A ΔT(ω) profile is ideally suited to reveal any internal length scales of the fluid. The apparatus also permits d to be varied continuously and in situ from zero to 3mm. © 1994.
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