Critical current under magnetic field of Bi2Sr2Ca1Cu2O8+delta/Ag tapes synthesized by electroplating

Bi-2212/Ag tapes have been synthesized by a process, del eloped with the ai m of manufacturing long superconducting lengths at a low economical cost. T he technique is based on a sequential electrodeposition of different elemen ts: copper, strontium, bismuth and calcium, on both sides of 50 mum thick p olycrystalline silver ribbons followed by thermal treatments. A detailed st udy of the influence of the process parameters on the microstructure has al lowed to obtain samples exhibiting very high J(C) values up to 40 000 A.cm( -2), in self-field at 77 K. In order to assess the potential applications o f the material, we have investigated the behavior of the critical current o f our tapes under an external magnetic field at 77 K and at 66 K from trans port measurements. The results reported here show that, while decreasing th e temperature from 77 K to 66 K, the critical current density increases up to a J(C) (0T, 66 K) value is in excess of 75 000 A.cm(-2). Moreover, at 66 K. our tapes are able to sustain supercurrent up to a magnetic field appli ed parallel to the plane of the tapes equal to 3 T.