A thermodynamic treatment suggests that the applied current density is located in the surface sheet in order to create a null magnetic local field inside the bulk superconductor according to the London penetration law, until there is no dissipation in the sample. A direct investigation of this evidence is performed by measuring the field created by the current near the surface of square- or rectangular-section samples. This field is known by the measurement of the flux variation in small pickup coils while the current is turned on and off. The main experimental result shows that the critical current intensity does not flow in a uniform distribution inside the sample section and so denies a physical meaning to the notion of critical current density.
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Thorel, P., Simon, Y. & Guetta, A. Applied current density in the section of a type-II superconductor. J Low Temp Phys 11, 333–347 (1973). https://doi.org/10.1007/BF00656557
- Uniform Distribution
- Magnetic Material
- Physical Meaning
- Local Field
- Current Intensity