Bi系銀シース線材のJ_c-B特性

抄録

The effect of uniaxial stress onto Ag-sheathed BiPbSrCaCuO on the J_c-B characteristics was investigated. It was shown that uniaxial stress was effective for the increase of J_c and n-value by the improvement of packing density and grain alignment. Larger J_c was obtained for the sample which included the low-T_c phase before pressing and sintering process. The existence of the low-T_c phase is expected to be useful for a good contact between grains after the growth of the high-T_c phase. The pinning potential was calculated from the measurement of the decay of the remanent magnetization at 4.2K, and it was revealed out that sample including the low-T_c phase at the initial stage had higher pinning potential.