Characterization of the Intermediate Mixed state in Niobium
Type II superconductors allow magnetic flux to penetrate the bulk in the form of vortices of supercurrent. When a current is applied and these vortices are free to move under the Lorentz force, zero electrical resistance is lost. From Amperes law current can only pass in regions where there is a gradient in vortex density and vortices can only move in the presence of a current. Some rare type II superconductors have an additional phase between the zero internal field Meissner state and the mixed state of vortex penetration- the intermediate mixed state (IMS). Here, due to an attractive interaction between vortices micron scale patches of vortex matter coexist with patches of zero field. Exactly how the current passes through interconnected areas of vortex matter is unknown just as what structure they form when in motion or not. SANS is the perfect tool to answer these questions and a novel method of measuring on the micron scale at D11 will be exploited.
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CUBITT Robert; LARSEN Camilla Buhl; LAVER Mark and PAUTRAT Alain. (2018). Characterization of the Intermediate Mixed state in Niobium. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2534