Superleak transducers of second sound inHe-He mixtures
Journal of Low Temperature Physics, ISSN: 0022-2291, Vol: 82, Issue: 3-4, Page: 185-215
1991
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Article Description
In a recent second-sound experiment in a diluteHe-He mixture, Church et al. were able to understand most of their data with the theory by d'Humières, Launay, and Libchaber. 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 coefficient D 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. © 1991 Plenum Publishing Corporation.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=34249923907&origin=inward; http://dx.doi.org/10.1007/bf00681527; http://link.springer.com/10.1007/BF00681527; http://link.springer.com/content/pdf/10.1007/BF00681527; http://link.springer.com/content/pdf/10.1007/BF00681527.pdf; http://link.springer.com/article/10.1007/BF00681527/fulltext.html; http://www.springerlink.com/index/10.1007/BF00681527; http://www.springerlink.com/index/pdf/10.1007/BF00681527; https://dx.doi.org/10.1007/bf00681527; https://link.springer.com/article/10.1007/BF00681527
Springer Nature
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