Trapped magnetic fields larger than 14 T in bulk YBa2Cu3O7-x

High trapped fields were found in zinc-doped, bulk melt-textured YBa2Cu3O7-x (YBCO) material showing a pronounced peak effect in the field dependence of the critical current density. Trapped fields up to 1.1 T were found at 77 K at the surface of a YBCO disk (diameter 26 mm, height 12 mm). Very high trapped fields up to 14.35 T were achieved at 22.5 K for a YBCO disk pair (diameter 26 mm, height 24 mm) by the addition of silver and using a bandage made of stainless steel. The pinning forces and trapped fields obtained in bulk YBCO material are compared with results reported for melt-processed NdBa2Cu3O7-x and SmBa2Cu3O7-x. (C) 2000 American Institute of Physics. [S0003-6951(00)03315-5].