美国贝尔实验室的S.金等指出,烧结YBa_2Cu_3O_7-δ超导体在77K温度和零磁场下的典型临界电流密度Jc约为500A/cm~2,而在1T时则只有1A/cm~2,远远低于Jc的理论上限(在77K时高于10~6A/cm~2),并且大大低于单晶的载流能力(大于10~4A/cm~2)。据认为,这与材料 S. Kim et al. Of Bell Labs in the United States point out that the typical critical current density Jc of sintered YBa 2 Cu 3 O 7-δ superconductors at 77 K and zero magnetic field is about 500 A / cm 2, while at 1 T they are only 1 A / cm 2, Far below the theoretical upper limit of Jc (higher than 10-6A / cm ~ 2 at 77K) and much lower than the current carrying capacity of single crystal (greater than 10-4A / cm2). It is believed that this with the material