VORTEX PHASE-DIAGRAM AND J(C) LIMITING FACTOR IN HIGH T-C BI2SR2CA2CU3O10/AG SUPERCONDUCTING TAPES

Based on our detailed measurements of current-voltage characteristics for a Bi2Sr2Ca2Cu3O10/Ag tape (Jc≅2×104 A/cm2 at 77 K and zero field) immersed in liquid neon (27 K) and in liquid oxygen (54-90 K) as a function of applied magnetic field up to 17 T, we extended the vortex phase diagram of superconducting Bi2Sr2Ca2Cu3O10 in the mixed state and show that Jc for this tape at T≥27 K in magnetic field (except at very low field) is fundamentally limited by the transition of the vortex-solid-to-liquid within grains rather than the dissipation from grain boundaries. © 1995 American Institute of Physics.