The critical currents and self-field ac losses of YBa2Cu 3Oy coated conductors and (Bi,Pb)2Sr 2Ca2Cu3Ox tapes were measured at several temperatures between 45K and the respective critical temperature. The temperature dependence of ac losses was measured at 50Hz using the lock-in method for a transport current. The frequency dependence of ac loss was measured at 55K for transport current frequencies from 25 to 400Hz. The results show that variation of ac transport loss as a function of normalized critical current is nearly the same at all temperatures in the measured temperature range for both YBa2Cu3Oy and (Bi,Pb)2Sr 2Ca2Cu3Ox tapes. The temperature dependence of the loss factor, however, is different for (Bi,Pb) 2Sr2Ca2Cu3Ox and YBa 2Cu3Oy tapes because of the ferromagnetic loss in the NiW-based coated conductor substrate. Similarities and differences in the temperature and frequency dependence of ac transport losses between (Bi,Pb)2Sr2Ca2Cu3Ox and YBa2Cu3Oy tapes are discussed.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Condensed Matter Physics
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry