U. Essmann and H. Träuble reported triangular vortex arrays, including defects, using electron microscopy on lead-indium and niobium samples in the remanent state.[ref]
The direct observation of individual flux lines in type II superconductors by U. Essmann and H. Träuble. Publisher abstract, materials, electron microscopy and remanent-state lattices
Such a prepared state need not display the equilibrium array at a uniform applied field. Images of regular positions and a proof of unrestricted vortex motion would answer different questions. Articles by others on the same topic
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