Energy losses in YBCO-123 coated conductors carrying transport current in perpendicular external magnetic field

In the work we present experimental results for AC losses and critical currents of biaxially aligned YBCO-123 coated conductors, with Hastelloy as a substrate material. The critical current density of the tapes was of the order of 4.10 9 A/m 2 at the liquid nitrogen temperature. Magnetization losses, in sinusoidally varying external AC fields directed perpendicular to the plane of the tapes, were measured using a standard Lock-in technique. The frequency of the magnetic field was in a range of 7-64 Hz. The losses in YBCO are pure hysteretic for amplitudes up to 40 mT. Magnetization losses in the tape when carrying DC transport current are also reported. From obtained experimental data of dynamic resistance and the magnetization losses the total losses dissipated in the tape have been evaluated and compared with the critical state model predictions.