Ability of a contactless inductive device for the characterization of the critical current versus temperature in superconducting rings at temperatures close to T_c

摘要

Critical current measurements for three polycrystalline rings of YBCO, three Bi-2223. and one YBCO + Ag were developed from a temperature close to 80 K to the critical temperature using a previously reported contactless inductive device based on the transformer method. These data were used to analyze the ability of this device to characterize, in superconducting rings, the Ginzburg-Landau, Ambegaokar-Baratoff, and De Gennes regimes as well as the crossover temperature between them.