Overview of critical currents and vortex trapping phenomena in massive and nanometric high-TC superconductors
Source abstract
Abstract
In this work, I shall summarize different phenomenological approaches of vortex trapping as well in conventional superconductors that serve as a basis for experimental fact interpretations in new superconductors as in massive and nanometric high critical temperature superconductors, and I shall present our experimental studies on vortex trapping in single crystals of La1.85Sr0.15CuO and YBa2Cu3O7-δ but also in nanoparticles of YBa2Cu3O7-δ. Particular attention should be paid to the study of high-TC superconducting nanoparticles of YBa2Cu3O7-δ system doped with magnetic nanoparticles of Y3Fe5O12. The reduction in the size of grains of these two compounds by mechanical grinding led to the size disparities of these grains, confirmed by an analysis by means of an atomic force microscope. These disparities are inherent in mechanical grinding. The average sizes of the obtained nanoparticles were estimated to be in the range of 80 nm by means of XRD reflection using the Scherrer equation. The nanometric size of the obtained grains revealed new phenomena considered in the past as contradictory like the coexistence of ferromagnetism and superconductivity and the trapping of vortices by spins which were studied here in detail and allowed us highlighting this coexistence and interpreting the variations in field and temperature of the critical current density JC in this system.
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Research context
OpenAlex topics: Physics of Superconductivity and Magnetism · Magnetic and transport properties of perovskites and related materials · Advanced Condensed Matter Physics
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