Performance at 10-50 K of Bi-2212/Ag multilayer tape fabricated by using pre-annealing and intermediate rolling process

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. (C) 1999 Elsevier Science B.V, All rights reserved.