The Intermediate State of a Hollow Superconducting Tin Cylinder

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Abstract
Small bismuth probes were used to measure the magnetic field inside and outside a long, hollow, thinwalled superconducting cylinder, both as a function of the applied field and as a function of the angular position of the probes. From the variation of the magnetic field the structure of the cylinder in the intermediate state was inferred. It would appear that with the onset of the intermediate state "windows" are formed at the poles of the cylinder. These "windows," through which the applied magnetic field can penetrate into the interior of the cylinder, probably consist of the usual rapidly alternating layers of normal and superconducting metal. The parts of the cylinder around the equator remain wholly superconducting until the applied field becomes equal to the critical field, at which time the entire cylinder becomes normal.

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