Angular dependence of the dynamic resistance and its relation to the AC transport current loss in Bi-2223/Ag tape superconductors

摘要

The dynamic resistance loss, DC transport current combined with external AC magnetic field, in a Bi_2Sr_2Ca_2Cu_3O_(10)/Ag superconducting tape is measured as a function of the orientation of the external AC magnetic field. We investigate the possibility of describing the AC transport current loss in an externally applied AC magnetic field from the much simpler dynamic resistance measurement. The orientation angles of the magnetic field with respect to the plane of the tape are changed from 0 deg (perpendicular configuration) to 90 deg (parallel configuration). The angular dependence of the dynamic resistance energy dissipation is described with an empirical formula. It is very similar to the angular dependence observed for the hysteresis loss. The dynamic resistance in parallel and perpendicular applied magnetic field is fairly well described with theoretical predictions based on the critical state model. The increase of the AC transport current loss due to a simultaneously applied AC magnetic field is described quite well with the dynamic resistance in the fully saturated state.