Relaxation times and mass diffusion in superfluid dilute3He-4He mixtures |
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Authors: | James Tuttle Fang Zhong Horst Meyer |
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Affiliation: | (1) Department of Physics, Duke University, Durham, North Carolina |
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Abstract: | Relaxation times are reported from the transients observed during thermal conductivity eff and thermal diffusionk
T
*
measurements in superfluid mixtures of3He in4He with a layer thickness of 1.81 mm. The experiments extend from 1.7 K toT
and over a3He concentration range 10–6 X<5×10–2. The agreement between the measured and the predicted from the two-fluid thermohydrodynamic equations is satisfactory forX>10–3 but deteriorates for smaller3He concentrations. This situation is similar to that for eff andk
T
*
results and indicates that the transport properties in very dilute mixtures with layers of finite thickness are not well understood. ForX>10–3, the mass diffusion coefficientD
iso for isolated3He in4He has been determined from and from eff measurements. There is an inconsistency by a constant numerical factor between these determinations. This problem might be related to the observations that in the superfluid phase, the relaxation times for different cell heightsh do not scale withh
2. FromD
iso derived via the eff data, the3He impurity-roton scattering cross section is determined. Comparisons with previous work are made. |
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Keywords: | |
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