- Josephson penetration depth
superconductivity, Josephson penetration depth characterizes the typical length on which an externally-applied magnetic fieldpenetrates into the long Josephson junction. Josephson penetration depth is usually denoted as and is given by the following expression (in SI):
where is the
magnetic flux quantum, is the critical current density , and characterizes the inductance of the superconducting electrodes
where is the thickness of the Josephson barrier (usually insulator), are the thicknesses of superconducting electrodes, and are their
London penetration depths.
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