A low temperature magnetic force microscope has been applied to spatially resolve single vortices in an epitaxially grown YBa₂Cu₃ O_7-δ thin film at 77 K. A disordered vortex arrangement is observed, and the vortices are strongly pinned. The observed phase is expected to be truly superconducting due to strong pinning.
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Moser et al. (1995) studied this question.
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