3D Properties in (RE)BCO Tapes measured in Fields up to 35 T [dataset]

We have measured the temperature and angular dependence of the upper critical field (B¬_C2) for three state of the art (RE)BCO HTS tapes using variable-temperature ac susceptibility measurements in applied fields up to 35 T. The three tapes measured were a Fujikura tape without artificial pinning centers and Superpower tapes with and without artificial pinning centers. We have obtained fits to our B_C2 (T,θ) data using both the anisotropic Ginzburg-Landau (G-L) model and Klemm’s model for layered superconductors. Our calculations suggest that these tapes are 3D at all temperatures in zero field but become 2D in magnetic fields above a crossover field of 457/γ T where γ=√(m_c/m_ab ) is the G-L anisotropy parameter. The values of γ were measured and show that the 3D-2D crossover fields in these tapes are at least 130 T.