Temperature-Dependent Irreversibility Magnetic Fields of High-T_c Superconducting BiPbSrCaCuO Tapes in the Magnetic Flux Densities up to 30 T in the Temperature Range from 33 to 90 K

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Temperature-dependent irreversibility magnetic fields, H_<irr> (T) were measured for four samples of silver-sheathed Bi_<1.8>Pb_<0.4>Sr_2Ca_<2.2>Cu_3O_x tapes having 3 levels of zero-field, 77 K critical current density, J_<co>, in magnetic flux densities up to 30 T and in the temperature range from 33 to 90 K. The measurements were performed for two orientations of the tape plane, the plane parallel to the applied magnetic field direction and that perpendicular to the applied field. The measurements show that H_<irr> increases with J_<co>, implying that H_<irr> is strongly dependent on the morphology of the superconductors. H_<irr> was obtained at 27.9 T and 54.7 K for the sample with J_<co>=298 A/mm^2 at 77.3 K.
社団法人応用物理学会の論文
1991-07-15