Abstract
By critical current, J c is meant the maximum lossless current, a superconductor can sustain before the voltage develops.
In general, there can be two contributions to the current flowing on the surface of superconductor. Consider, for example, a superconducting wire along which we are passing a current from some external source. We call this, the transport current (because it transports charge into and out of the wire). If the wire is in an applied magnetic field, screening currents circulate so as to cancel the flux inside. These screening currents are superimposed on the transport current, and at any point, the current density is
where \(\vec{J}_{\rm t}\) is due to transport current and \(\vec{J}_{\rm H}\) arises form screening current.
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Keywords
- High Temperature Superconductor
- Critical Current
- Critical Current Density
- Coherence Length
- Josephson Junction
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Saxena, A.K. (2009). Critical Current. In: High-Temperature Superconductors. Springer Series in Materials Science, vol 125. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00712-5_3
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DOI: https://doi.org/10.1007/978-3-642-00712-5_3
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