Observation of a new surface state on 4He crystal interfaces
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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4
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Physical Review Letters, Volume 75, issue 18, pp. 3324-3327
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 α. For surfaces tilted by an angle φ100 μrad with respect to the c-facet, we obtain α=κ/φ, contrary to the linear angular dependence predicted by current theories. Our results on four large crystals yield κ=(11±3) ×10-4T erg/ cm2 K.Description
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Babkin, A V, Alles, H, Hakonen, P J, Parshin, A Y, Ruutu, J P & Saramäki, J P 1995, 'Observation of a new surface state on 4 He crystal interfaces', Physical Review Letters, vol. 75, no. 18, pp. 3324-3327. https://doi.org/10.1103/PhysRevLett.75.3324