Institution: | a National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan b CREST, Japan Science and Technology, Tsukuba 305-0047, Japan c Showa Electric Wire and Cable, Kawasaki 210-0843, Japan |
Abstract: | High-transport critical current density (Jc-oxide)>500 kA/cm2 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 (Ic) are investigated at temperatures ranging 10–50 K by using helium gas cooling and liquid neon. Field-temperature curves for Ic=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 Ic=267 A (engineering-Jc=303 A/mm2, Jc-oxide=151 kA/cm2) and 92 A (104 A/mm2, 52 kA/cm2) at 27.1 K (in liquid neon), in magnetic fields (parallel to the tape surface) of 2 and 10 T, respectively. Engineering-Jc of 100 A/mm2 is obtained even in the perpendicular field of 0.5 T at 27.1 K. |