Measurements of Energy Losses in Monofilamentary Superconductors

摘要

The results of ac loss measurements on a multilayered Nb and Nb3Al monofilament are presented. The sample wire consisted of a multilayered Nb-Al filament structure with Nb layers 1 micron thick, wound on an insulating cylinder in an antiinductive configuration. The Nb3Al compound was formed using a thermal process. The measurements were done at 4.2, 7.5 and 11 K. A linear relationship in the log-log plot of power versus intensity is obtained. The exponent is monotonically decreasing with the temperature and is always higher then the value predicted by Bean's model.