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Magnetic field dependence of critical current density (J_{c}) of bulk MgB₂ material at 20 K is reported. The selected sintered MgB₂ materials contained various amounts of silver. The silver added samples possess always a higher critical current density than the silver free ones. The critical current density increased with silver content and continuously decreased with increase of magnetic field. Further,...
Magnetic field dependence of critical current density (J_{c}) of ErBa_2Cu_3O_y thick film "Er-123" and melt textured GdBa_2Cu_3O_y bulk "Gd-123" at liquid nitrogen temperature is reported. Gd-123 exhibits a usual peak effect at magnetic fields around 2 T, while J_{c} of the Er-123 thick film continuously decreases with increasing field. The model of thermally activated flux motion...
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