Investigation of Hysteresis and Transport Critical Current under Field Cycle for Bi-Based Multifilamentary Tapes

Lance Horng ； K. Chen ； W. D. Lee ； T. J. Yang

《Chinese Journal of Physics》 34卷2S期 (1996/04) Pp. 710-714

並列摘要

The transport properties of Bi-based multifilamentary tapes on magnetic field have been studied. The tapes were fabricated by powder-in-silver tubing technique followed by appropriate sintering. The hysteretic behavior of transport critical current of the tapes with bending strain has been investigated. The experimental data are obtained at 77 K under field cycling from 0 to 1000 G to 0. The critical current density under a field does not vary when bending strain is smaller than a critical bending strain, and then decreases gradually with increasing bending strain. The normalized values are unaffected by bending strain up to 1.31%. The remnant magnetic filed H, associated with the flux pinning force is obtained by an empirical expression! which is similar to generalized critical state model. The Hm is almost a constant for all bending strain. This observation indicates that the intrinsic pinning properties are not varied with bending strain.