Elementary steps on the He-4 crystal interface probed by He-3 atoms

Tsepelin, Viktor and Saramaki, J. P. and Babkin, A. and Hakonen, P. J. and Hyvonen, J. J. and Luusalo, R. M. and Parshin, A. Y. and Tvalashvili, G. K. (1999) Elementary steps on the He-4 crystal interface probed by He-3 atoms. Physical review letters, 83 (23). pp. 4804-4807. ISSN 1079-7114

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The growth dynamics of c facets, governed by individual Frank-Read type of sources, has been studied at millikelvin temperatures in the presence of small concentrations of He-3 atoms in the liquid. We find that in the spiral growth regime, interaction of He-3 atoms with moving elementary steps on the surface results in additional friction. Our results are compared with theory, where high-frequency (omega greater than or equal to T/(h) over bar) zero-point oscillations of the steps are taken into account. There is a good agreement if we assume the amplitude of these oscillations xi approximate to 5 nm.

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Physical review letters
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03 Feb 2009 13:18
Last Modified:
01 Jan 2022 09:03