Superconductor with high trapped field

摘要

There is provided RE-Ba-Cu-O oxide bulk superconductors in which high magnetic force can be attained at relatively high temperature. Neutron irradiation, etc. is applied to RE-Ba-Cu-O bulk superconductors wherein RE is one or more than two elements selected from La, Nd, Sm, Eu, Gd, Y, Ho and Dy to disperse 5 to 50 % of an "amorphous phase" or "recrystallized phase having a crystal orientation different from that of the parent phase" of 10 to 500 nm in grain size in the parent phase. More preferably, neutron irradiation, etc. is applied to bulk superconductors comprising "a RE1+xBa2-xCu3Oz crystal phase having oxygen concentration different from that of the parent phase" dispersed in the parent phase. In these cases, the parent phase may also comprise a dispersed phase of RE2BaCuO5 crystals or RE4+2dBa2+2dCu2-dOg crystals wherein 0.2 < d < 0 and 9.4 < g < 10 in the parent phase.