Helical Vortex Structures in Current-Carrying Wires
All useful properties of superconductors derive from zero electrical resistance. In Type-II materials, resistance comes from magnetic flux lines or vortices crossing the applied current. The self-field of a current in a wire circulates around the wire axis, and when this enters the sample and is forced to the wire axis, a voltage is observed that varies as current squared. How this self-field combines with an applied longitudinal field is the subject of fierce theoretical debate: the combination of vortex rings and lines could produce a helical vortex structure or the rings could merely cross the lines via kinks. Previously evidence for rings crossing lines was found by SANS but another experiment with slightly different conditions gave indirect evidence for helicity. Here we propose an experiment to resolve the issue.
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CUBITT Robert; BLACKBURN Elizabeth; FORGAN Edward M. and JELLYMAN Erik. (2015). Helical Vortex Structures in Current-Carrying Wires. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-815
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