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Observation of a new surface state on4He crystal interfaces

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Czechoslovak Journal of Physics Aims and scope

Abstract

The equilibrium shape ofhcp 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\(\tilde \alpha \). For surfaces tilted by an angle ϕ≤100 μrad with respect to the c-facet, we obtain\(\tilde \alpha = \kappa /\phi \), contrary to the linear angular dependence predicted by current theories.

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Author notes

  1. Harry Alles

    Present address: Dept. of Physics, University of Manchester, M13 9PL, Manchester, England

Authors and Affiliations

  1. Low Temperature Laboratory, Helsinki University of Technology, 02150, Espoo, Finland

    Alexei Babkin, Harry Alles, Pertti Hakonen, Alexander Parshin, Juusi Ruutu & Jari Saramäki

  2. P.L. Kapitza Institute for Physical Problems, ul. Kosygina 2, 117334, Moscow, Russia

    Alexander Parshin

Authors
  1. Alexei Babkin
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  2. Harry Alles
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  3. Pertti Hakonen
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  4. Alexander Parshin
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  5. Juusi Ruutu
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  6. Jari Saramäki
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Babkin, A., Alles, H., Hakonen, P. et al. Observation of a new surface state on4He crystal interfaces. Czech J Phys 46 (Suppl 1), 465–466 (1996). https://doi.org/10.1007/BF02569648

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  • DOI: https://doi.org/10.1007/BF02569648

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