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The results of several new types of experiments on 1OW-K type-II hysteretic superconductors are reported. These include measurements of the detailed structure of hysteresis loops, surface-coating experiments, hollow-cylinder magnetization measurements, transport-current measurements, and magnetization of totally hysteretic samples. These results are interpreted in terms of a surface mechanism for hysteresis.

and Flux-trapping properties of type-II superconductors are described. A linear relationship between the remnant magnetization and the internal field is observed in the 1OW-K superconductors but not in Nb 3 Sn and Nb 3 Zr. It was found that the linear relationship and the associated slopes are to a large extent independent of much of the bulk and are related to surface currents. In addition, the linear relationships are observed only in 1OW-K superconductors that exhibit appreciable diamagnetic behavior.