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<p>The passage from electrical super-conductivity to normal conductivity of metals at low temperatures may be attained with a critical current density or by the application of a critical magnetic field. The author regards these two means as interdependent. In a previous paper the case of a wire conveying a current was treated and the magnetic field resulting was such as to give rise to a central superconducting core with an outer resisting layer. This condition is unstable. The present note contains a more complete solution of the problem by Langevin. According to this there are three regions: (1) a superconducting core where the field (H) due to the current
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<br>Subjects: electrical conductivity; temperatures (high and low); Condensed matter; electronic structure, electrical, magnetic, and optical properties</div>
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