[6a-PB1-1~46] 11 Superconductivity（Poster）

[6a-PB1-4] Critical currents of grain boundaries in SmBa₂Cu₃O_y + BaHfO₃ films fabricated on bicrystal substrates

〇Junya Akita¹, Yuji Tsuchiya¹, Yusuke Ichino¹, Yutaka Yoshida¹ (1.Nagoya Univ.)

Keywords:superconductor, grain boundary, REBCO

Critical currents in REBa₂Cu₃O_y films are significantly suppressed at the grain boundaries. For the applications and the futher development of coated conductors, it is important to understand the critical current properties of grain boundaries under various conditions. We have, therefore, measured the critical current densities in SmBa₂Cu₃O_y films fabricated on bicrystals under various measurement temperatures and magnetic fields. We have also prepared SmBa₂Cu₃O_y + BaHfO₃ films in order to investigate the contrasting critical current properties between both pure SmBa₂Cu₃O_y films and SmBa₂Cu₃O_y films with artificial pinning centers. The results imply that the suppression at the grain boundaries in SmBa₂Cu₃O_y + BaHfO₃ films could be less than that for pure SmBa₂Cu₃O_y films.