Abstract
Bi2Sr2CaCu2Ox (Bi-2212) superconducting thick films incorporating Bi-2212 superconducting whiskers have been prepared using a partial melting method. Hysteresis behavior of critical current density (Jc) for magnetic field is observed in a film without whiskers (monolithic film), but not noticeably in composite film (whisker content: 20 wt %). It is found from ac susceptibility measurement that a peak in χ″, resulting from weak links, appears at a higher temperature for the composite film than for the monolithic film. Jc decreases with increasing magnetic field more rapidly for the monolithic film than for the composite film less than 1 T. These results indicate that the incorporation of the whiskers is effective for overcoming weak links. In consequence Jc for the composite film is about three times higher than for the monolithic film. It is clear from SEM observation that a microstructural improvement leads to an increase in Jc.
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