The effects of current on the intermediate mixed stat in niobium
The intermediate mixed state (IMS) in a superconductor is found between complete magnetic flux expulsion (the Meissner state) and the penetration of an array of supercurrent vortices (the mixed state). Here we find in Niobium, due to a rare attractive interaction between vortices, a coincidence of these two phases separated on the micron scale. Recent work, with the use of VSANS, going down to a Qmin of 6x10-4 Å-1 followed the temperature dependence of the vortex spacing in the IMS which could be explained by a the standard BCS variation of the London penetration depth. They did not report on any low Q scattering from the mixed state regions which have been shown to exist on the micron scale as shown by the Bitter decoration in figure 1 . They did however see a finite size effect on the Bragg peak corresponding to domains just over a micron at low temperatures. Regions of where the IMS exists within the bulk have been qualitatively imaged using interference techniques but they could not make a quantitative measurement of the IMS structure in the bulk.
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CUBITT Robert and BREMS Xaver. (2020). The effects of current on the intermediate mixed stat in niobium. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.EASY-568
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