Abstract
By studying the transmission coefficient of ultrasonic waves perpendicular to the solid-liquid interface, we have measured the mobility of vicinal surfaces of4He crystrals for different crystallographic orientations and in the temperature range from 0.38 K to 1 K. The results show an angular dependency of the vicinal mobility as predicted by theory. Further, in comparison with rough interfaces, a spectacular decrease for the mobility of vicinal surfaces due to the decreasing number of moving sites is in good agreement with preceeding results for the phonon term. It has been observed for the first time for the roton term.
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Amrit, J., Legros, P. & Poitrenaud, J. Rough and vicinal surfaces of helium-4 crystals. Mobility measurements. J Low Temp Phys 100, 121–130 (1995). https://doi.org/10.1007/BF00753839
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DOI: https://doi.org/10.1007/BF00753839