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Ic - B - T Evaluation for High-Tc Superconductors in Pressurized/Depressurized Liquid Nitrogen

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5 Author(s)
Nishijima, G. ; Supercond. Wire Unit, Nat. Inst. for Mater. Sci. (NIMS), Tsukuba, Japan ; Tsuchiya, Y. ; Kitaguchi, H. ; Nishimura, T.
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Critical current (Ic) and n-values were evaluated for commercially available (Bi, Pb)2Sr2Ca2Cu3O10 (Bi-2223), GdBa2Cu3O7 (GdBCO) and (RE)Ba2Cu3O7 (REBCO, RE = rare earth) superconducting tapes. The transport properties were investigated in magnetic fields up to 1 T in various temperatures around 77 K. The measurements up to the transport current of 500 A were performed in pressurized and depressurized liquid nitrogen using a newly developed apparatus. Bi-2223 showed the largest Ic for magnetic field parallel to the tape surface, whereas it showed the largest anisotropy. It was found that the in-field Ic property of GdBCO was improved. The effect of artificial pinning centers introduced for REBCO was confirmed.

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Applied Superconductivity, IEEE Transactions on  (Volume:23 ,  Issue: 3 )