The London penetration depth and the Josephson penetration depth are two distinct concepts in superconductivity. The London penetration depth refers to the distance a magnetic field penetrates into a bulk superconductor, while the Josephson penetration depth pertains to the flux distribution within a long Josephson junction. The Josephson depth does not directly depend on the properties of the superconductors forming the junction, although it is implicitly influenced by the critical current density (jc).
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