Dimples due to dislocations at the superfluid/solid interface of4He
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Abstract
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.
PACS numbers
67.80.-s 68.45.-v 61.70.-rPreview
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© Plenum Publishing Corporation 1995