[13p-B406-1~13] 11.3 Critical Current, Superconducting Power Applications

[13p-B406-1] Temperature dependence of self-field critical current densities in YBCO thin films

〇Hirofumi Yamasaki¹ (1.AIST)

Keywords:YBCO thin films, self-field critical current densities, temperature dependence

Temperature dependence of YBCO thin films containing a high-density of fine nanoprecipitates showed J_c(T) ~ (1 – T/T_c)^m(1 + T/T_c)², m ≈ 2.5 in B = 0.5–1 T, but the index m was smaller (1.5–1.7) in self-fields. Similar properties were observed in YBCO thin films containing a high-density of relatively-large nanoprecipitates and in Fluorine-free-MOD YBCO thin films containing stacking faults (SFs) and dislocation pins surrounding SFs. It is considered that the self-field J_c is determined by low-density of relatively-large nanoprecipitates.