Magnetic-Field Angle Dependence of The Critical Current Density in Bi-2223 Superconducting Tape

摘要: Critical current densities (Jc) have been investigated in Ag — sheathed Bi-2223 superconducting tapes which were prepared by powder-in-tube technique. The Jc was measured terms of both magnitude (B) and angle (Θ) to the tape surface magnetic field. In high range, that is, field component perpendicular (BsinΘ) large, values able be expressed one universal function independently That proportional logarithm BsinΘ (i.e., ∝ log(BsinΘ)). out when decreased saturated range near Θ = 0. angles at began part from above hardly depended on It considered sample basically dominated surface, parallel c-axis crystal structure. suppression low may due misaligned grains. SEM. estimated mean misalignment about 10°.