Abstract
As part of the on-going VAMAS program aiming at the establishment of standard measurement methods for superconducting critical parameters of high temperature oxide superconductors, we studied the effect of applied magnetic field angle relative to the specimen on the critical current IC, using a 12 T split-paired superconducting magnet and Ag-sheathed Bi-2212 and Bi-2223 tapes fabricated by a powder-in-tube method. In the Bi-2223 tapes large hysteresis was observed in IC — B curves as well as in IC — field angle curves, while no appreciable hysteresis existed in the Bi-2212 tapes. When corrected to the normal component of applied field, the hysteretic IC — field angle curves well coincided with the hysteretic IC — B curves. Thus, it was found that except for fields nearly parallel to the tape surface, the field angle dependence of transport critical current is dominated by the magnetic field component normal to the tape surface.
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