Abstract
In a recent second-sound experiment in a dilute3He-4He mixture, Church et al.11 were able to understand most of their data with the theory by d'Humières, Launay, and Libchaber.8 However, significant discrepancies exist at lower frequencies. We show that diffusive currents across the superleak are responsible for this deviation. What is more, we are able to determine the diffusion coefficientD from the low-frequency data.
The equations governing the performance of oscillating superleak transducers and Peshkov transducers are derived in a systematic manner. This pertains to pure He-II as well as to mixtures. Mistakes in earlier works on dissipative effects of superleak transducers are corrected. Explicit formulas are given for the amplitude and linewidth of second sound, and the experimentally relevant parameters are discussed.
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Henjes, K., Liu, M. Superleak transducers of second sound in3He-4He mixtures. J Low Temp Phys 82, 185–215 (1991). https://doi.org/10.1007/BF00681527
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DOI: https://doi.org/10.1007/BF00681527