"In practice, HTS are limited by the irreversibility field H, above which magnetic vortices melt or decouple. Even though BSCCO has a higher upper critical fiel

"In practice, HTS are limited by the irreversibility field H, above which magnetic vortices melt or decouple. Even though BSCCO has a higher upper critical field than YBCO it has a much lower H (typically smaller by a factor of 100)[11] thus limiting its use for making high-field magnets." https://en.wikipedia.org/wiki/Bismuth_strontium_calcium_copper_oxide https://en.wikipedia.org/wiki/Bismuth_strontium_calcium_copp...