Observation of a New Surface State on 4He Crystal Interfaces

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Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
1995
Major/Subject
Mcode
Degree programme
Language
en
Pages
3324-3327
Series
Physical Review Letters, Volume 75, Issue 18
Abstract
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. Our results on four large crystals yield κ=(11±3)×10 exp −4T erg/ cm exp 2 K.
Description
Keywords
helium, crystal, interface
Other note
Citation
Babkin, A. V. & Alles, H. & Hakonen, Pertti J. & Parshin, A. Ya. & Ruutu, J. P. & Saramäki, J. P. 1995. Observation of a New Surface State on 4He Crystal Interfaces. Physical Review Letters. Volume 75, Issue 18. 3324-3327. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.75.3324