Abstract
AC complex susceptibility chi '-i chi , DC magnetization, resistive transition curves in various magnetic fields, and the critical-current density were measured for sintered Bi-Sr-Ca-Cu-O and Tl-Ba-Ca-Cu-O samples whose major phase was the high-T/sub c/ phase of each system. The single peak observed in chi vs. temperature curves was very sharp for both samples of each system. The hysteresis in DC magnetization curves at 77 K rapidly decreased with increasing magnetic field for both systems. This may be related to the layered morphology of the platelike grains. The resistive transition curves of both samples were broadened by the application of a magnetic field as in the case of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 7/. In magnetic fields, rather long tails to low temperatures were observed in resistive transition curves for Bi-Sr-Ca-Cu-O. J/sub c/s at 77 K and zero field were 250 A/cm/sup 2/ and 600 A/cm/sup 2/ for Bi- and Tl-based samples, respectively. These J/sub c/s rapidly decreased with increasing magnetic field. >
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