DC field effects on the susceptibility of YBa2Cu3O7-δ using a low field eddy current model

Abstract

AC susceptibility measurements were obtained for a bulk superconducting YBCO sample with a superimposed DC field. To interpret results, a low field eddy current model is used to simulate data results. Increasing the applied AC field strength causes a decrease in magnitude to the in-phase susceptibility, signaling a decrease in the material's shielding ability. The out of phase susceptibility shows that increasing the AC field strength causes the intergranular losses to persist into lower temperatures. Increasing the DC field strength on the other hand does not cause the material to lose its shielding ability nor does it cause persistence to lower temperature of the intergranular losses.