AC losses of arrays of superconducting strips on metallic substrates

The loss component of the AC susceptibility, chi ", for x-arrays of thin-fi lm superconducting YBCO strips on metallic substrates was investigated both theoretically and experimentally. The contributions to chi " due to the hy steretic loss in the superconducting strips and the eddy current loss in th e substrate were calculated as a function of temperature for varying width and lateral separation of the strips, AC magnetic field amplitude and frequ ency, as well as substrate and film thickness. At low frequencies (f simila r to 100 Hz), chi " is dominated by the frequency-independent hysteretic co mponent which decreases as the strips become narrower. With decreasing inte r-strip separation, the hysteretic chi " increases, while the associated pe ak in the temperature dependence of chi " broadens and shifts to lower temp eratures. The frequency-dependent eddy current contribution to chi " become s more prominent as the frequency increases. (C) 2000 Elsevier Science B.V. All rights reserved.