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Publication
Applied Physics Letters
Paper
Optical probing technique for inhomogeneous superconducting films
Abstract
We report a nondestructive optical probing technique for superconducting films, by which a cross-sectional gradient of the local transition temperature Tc and a two-dimensional map of the local critical current I c of an Al film were obtained. The two-dimensional map clearly shows a variety of defects of the Al film. Some of them can be correlated to visible pinholes.