Improvement of magnetic properties in Bi-2212 ceramics by fluorine doping

Flux pinning by Al-based nano particles embedded in polycrystalline (Bi,Pb)-2223 superconductors

“…The improvement of J c and its behavior under a magnetic field J c (H) can be obtained by introducing efficient pinning centers with a size (matching the coherence length) that can suppress the flux flow. Various methods have been used to introduce effective artificial pinning centers and to increase their number [1][2][3][4][5][6][7][8][9][10][11][12][13]. Precipitates dispersed into the superconducting matrix are often found to be an effective pinning source.…”

Flux pinning properties of Yb substituted (Bi,Pb)-2212 superconductor

“…Extensive research work has been done to improve the superconducting and flux pinning properties of this system. It has been found that low angle grain boundaries, stacking faults, twin boundaries, impurity phases, precipitates, secondary phases, growth dislocation, point defects, oxygen vacancies, structural nonuniformities, and other objects of different dimensionality can act as pinning centers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The doping of impurities with size of the order of the coherence length or creation of nanosize defects in the system by adjusting the processing condition can create effective pinning centers.…”

Infield response of (Al2O3)x/CuTl-1223 nanoparticles-superconductor composites

“…Resistive dissipation causes a variety of problems, which include reduced efficiency of transmission lines, and noise in superconductivity based devices. At low temperatures and currents, the inhomogenities, dislocations, grain-boundaries and rough surfaces are the sources of intrinsic pinning in a superconductor material [5][6][7][8][9]. This pinning locks the vortices in place and reduces the resistance.…”