Abstract
Recent experiments by Maynard et al on fourth sound in a Grafoil-filled4He cell show a periodic dependence of the resonant frequency on the average number of solid layers. We interpret their sharp minima as resulting from the inherent smoothness of complete layers, which inhibits the propagation of waves of melting and freezing, and reduces their damping and their coupling to fourth sound. Using a lattice-gas model, we study the roughness of incomplete surface layers, and suggest how this can lead to the observed broad maxima. We predict that the maxima of damping and of resonant frequency coincide.
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Adler, J., Kuper, C.G. & Schulman, L.S. Layer-by-layer growth of solid4He on graphite. J Low Temp Phys 52, 73–79 (1983). https://doi.org/10.1007/BF00681266
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DOI: https://doi.org/10.1007/BF00681266