Abstract
Whiskers grown by extrusion from tin plate are known to have irregular cross sections; one such whisker could be regarded as a cylinder of approximately 2 µ in diameter, attached to which, with its plane parallel to the cylinder axis, was a thin film of an approximate thickness of 1000 Å. The superconducting transition of this whisker was studied resistively as a function of magnetic field, temperature, and elastic strain, and is interpreted in terms of two independent phase diagrams, one being attributed to the cylinder and one to the thin film; size effects are discussed. It seems that the cylinder and the thin film behaved as two separate systems in parallel, allowing, for example, the coexistence of a stable superconducting state in the film and a metastable normal state in the cylinder.
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Rothberg, B.D., Nabarro, F.R.N. & McLachlan, D.S. A tin whisker with two independent superconducting phase diagrams. J Low Temp Phys 5, 665–681 (1971). https://doi.org/10.1007/BF00628416
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DOI: https://doi.org/10.1007/BF00628416