Abstract
Single-crystal whiskers of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub x/ with a length of about 4 mm were grown from an Sb-doped precursor. The optimum nominal composition of precursors in this Sb-doping method is Y/sub 2/Ba/sub 2.75/Cu/sub 3/Sb/sub 0.5/O/sub x/. Sb is not detected in the whiskers by energy-dispersive x-ray spectroscopy (EDS). The standard 4-probe transport measurements for the as-grown whiskers show a critical temperature T/sub C/ of about 90 K and a c-axis critical current density J/sub C/ of 9.51/spl times/10/sup 4/ A/cm/sup 2/ at 89 K.
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