Microwave absorption studies of Y-Ba-Cu-O

The magnetic field dependence of the microwave absorption of bulk ceramic Y sub 1 Ba sub 2 Cu sub 3 O sub x has been measured as a function of temperature. Below the superconducting transition temperature, the microwave absorption increases with increasing magnetic-flux penetration into the sample, and the absorption exhibits considerable hysteresis resulting from hysteresis in sample magnetization. Also, when the applied magnetic field is removed, there is a remanent absorption due to the remanent sample magnetization. 7 ref.--AA