Dimples due to dislocations at the superfluid/solid interface of 4He

H. Alles*, A. V. Babkin, P. J. Hakonen, J. P. Ruutu, J. P. Saramäki, A.Ya. Parshin

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)


On vicinal planes the surface stiffness is quite anisotropic and a crystal defect, terminating at the interface, is predicted to produce a 10...50 nm deep dimple with macroscopic lateral extent (up to a few mm). We have searched for such depressions using high resolution interferometry. Sometimes our measured interferograms of the super fluid/solid interface display unexpectedly large dimples. The volume and shape of the observed objects suggest that these dimples are caused by bundles of about 10 dislocations.

Original languageEnglish
Pages (from-to)519-523
Number of pages5
JournalJournal of Low Temperature Physics
Issue number3
Publication statusPublished - Nov 1995
MoE publication typeA1 Journal article-refereed


  • crystal
  • helium
  • interface


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