MICROWAVE-ABSORPTION MEASUREMENTS OF HIGH-TEMPERATURE SUPERCONDUCTORS USING A COPLANAR WAVE-GUIDE

A wideband microwave absorption spectrometer with a coplanar waveguide transmission line was used to characterize the magnetic field dependence of microwave absorption in high temperature superconductors. This technique is useful for the nondestructive evaluation of high temperature superconductor bulk and thin film samples prior to their application in microwave devices and sensors. Results are presented for various types and forms of samples including bulk YBCO, laser-ablated thin film YBCO, and Ag-doped YBCO wire.