A Josephson vortex is a topological defect that occurs in a type-II superconductor when two superconducting regions are separated by a thin insulating barrier, forming what is known as a Josephson junction. In this junction, when a magnetic field is applied, quantized magnetic flux lines known as "vortices" can penetrate the superconducting regions. In a Josephson junction, under certain conditions, the supercurrent can flow across the junction without the application of an external voltage.
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