Observation of a new surface state on 4He crystal interfaces

Alexei Babkin*, Harry Alles, Pertti Hakonen, Alexander Parshin, Jussi Ruutu, Jari Saramäki

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


The equilibrium shape of hcp 4He crystals has been studied at temperatures 0.05 ≤ T ≤ 0.7 K by means of a high precision optical interferometer. We find that the profile of the interfacial boundary, close to an almost horizontal c-facet, has a well-defined slope discontinuity separating two angular regions with different behavior of the surface stiffness α̃. For surfaces tilted by an angle Φ ≤ 100 μrad with respect to the c-facet, we obtain α̃ = κ/Φ, contrary to the linear angular dependence predicted by current theories.

Original languageEnglish
Pages (from-to)465-466
Number of pages2
JournalCzechoslovak Journal of Physics
Issue numberSuppl. 1
Publication statusPublished - 1996
MoE publication typeA1 Journal article-refereed

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