[19p-B403-1~12] 11.3 Critical Current, Superconducting Power Applications

[19p-B403-1] Consideration to J_c(H, θ) of (RE)BCO films containing relatively-large nanoprecipitates

〇Hirofumi Yamasaki¹ (1.AIST)

Keywords:(RE)BCO thin films, flux pinning, nanoprecipitates

The author and coworkers found that relatively large nanoprecipitates produced broad J_c(θ) peaks centerd at the c-axis in YBCO thin films, which has been reasonably explained by a simple theoretical model that considers the direct summation of core pinning interactions and the angular dependence of the coherence length. Several research groups have recently observed flat J_c(θ) curves that are as high as J_c at H // ab in (RE)BCO thin films containing nanoprecipitates whose sizes are 1–3 times larger than the diameter of a normal core of a flux line. The author has considered the cause of such J_c(θ) curves.