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The domain structure of the magnetic flux distribution in thin foils of superconducting niobium has been studied at 4.2°K for different sample shapes. The foil thickness was 18 μm. The experiments were carried out with a magneto-optical apparatus which utilizes the high specific Faraday rotation in thin films of a mixture of EuS and EuF2. The macroscopic domain structure of the magnetic flux was found to be closely related to the sample shape.
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Rowe et al. (1971) studied this question.
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