Abstract
High-transport critical current density ( J c-oxide)>500 kA/cm 2 at 4.2 K, 10 T can be obtained for Bi-2212/Ag tapes fabricated by using pre-annealing and intermediate rolling (PAIR) and melt-solidification process. In this paper, we report high-temperature properties of PAIR-processed Bi-2212/Ag multilayer tape in order to show their potential for practical applications operated at cryocooling temperatures. Magnetic field dependence and angular dependence of critical current ( I c) are investigated at temperatures ranging 10–50 K by using helium gas cooling and liquid neon. Field-temperature curves for I c=0.2 and 2.0 A are also determined in order to show the approximation of the irreversible field. High-temperature performance of the tape is attractive to consider future applications. For example, the best sample carries I c=267 A (engineering- J c=303 A/mm 2, J c-oxide=151 kA/cm 2) and 92 A (104 A/mm 2, 52 kA/cm 2) at 27.1 K (in liquid neon), in magnetic fields (parallel to the tape surface) of 2 and 10 T, respectively. Engineering- J c of 100 A/mm 2 is obtained even in the perpendicular field of 0.5 T at 27.1 K.
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