Vortex phase diagram and J c limiting factor in high T c Bi2Sr2Ca2Cu3O10/Ag superconducting tapes

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Abstract
Based on our detailed measurements of current–voltage characteristics for a Bi2Sr2Ca2Cu3O10/Ag tape (J c ≂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 J c 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.