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

Research output: Contribution to journalJournal article


  • Viktor Tsepelin
  • J. P. Saramaki
  • A. Babkin
  • P. J. Hakonen
  • J. J. Hyvonen
  • R. M. Luusalo
  • A. Y. Parshin
  • G. K. Tvalashvili
Journal publication date12/1999
JournalPhysical Review Letters
Number of pages4
Original languageEnglish


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.