Abstract
Magnetic susceptibility and critical current density of superconducting fibres of the BiSrCaCuO system grown by laser floating zone (LFZ) technique are strongly dependent on pulling rates. A favourable grain orientation for current transport was obtained for the highest pulling rate, 4.17 × 10 −6 ms −1. Fibres grown in this condition show the lowest fraction of superconducting phases but exhibit the highest values of J c. Epitaxial growth of superconducting phases 2212 and 4413 on the primary phase to crystallize, Sr 0.3Ca 0.7CuO 2 ( 1 1 ), leads to the favourable alignment of the b-axis to the fibre axis. After heat treatment this orientation remains in the new crystals of 2212 and 2223 phases.
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