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Jacek Sosnowski; Influence of nano-sized defects on the critical currents phenomena in HTc multilayered superconductors; Advanced NanoMaterials and Technologies for Energy Sector; 2018:2(1): 196-215
In this paper, the analysis of the influence of nano-sized defects on the critical current phenomena in the multilayered HTc superconductors is presented. The formation of the pinning potential barrier, determining the superconducting transport current flow, current-voltage characteristics, shapes and critical current limitations are discussed. Various initial positions of pancake vortices in the respect to nano-defects edge, acting as the pinning centers are considered. Influence of this initial position on pinning potential barrier magnitude is regarded. The elasticity forces of the vortex lattice are included into this model. It is considered influence of nano-defects created at fast neutrons irradiation process, arising during the work of the modern nuclear accelerators with superconducting windings and HTc superconducting current leads. Also, defects in the form of micro-cracks created especially during winding of the superconducting coils are considered in this paper. The influence of microscopic defects on the current-voltage characteristics in static and dynamic cases is considered. Attention is devoted to dynamic case, in which interesting phenomenon - peak effect should appear. Influence of nano-defects on the perpendicular to layers Josephson’s currents is regarded. Presented effects influence the work of HTc superconducting cables. The short model of the constructed by author cryocable is presented and progress in this field is briefly reviewed.