Abstract
A high critical current density Jc with a nearly isotropic angular dependence at 77.3 K was recently obtained by the introduction of nanoparticlesto (Y,RE)Ba2Cu3Oy (RE123, RE = Sm, Gd)-coated conductors prepared by trifluoroacetate metal–organic deposition (TFA-MOD).The flux pinning properties were evaluated on the basis of detailed measurements of theupper critical field, the irreversibility field and the critical current density of theTFA-MOD RE123-coated conductor. We found that strong random pinning by theBaZrO3 nanoparticlesand weak c-axis correlated pinning by twin boundaries functioned cooperatively in nanoparticles introducedto (Y, Gd)123-coated conductors prepared by TFA-MOD. The coexistence of two differentpinning centers played an important role in the nearly isotropic angular dependence ofJc.
Published Version
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