[19p-212B-1~15] 11.3 Critical Current, Superconducting Power Applications

[19p-212B-9] [Young Scientist Presentation Award Speech] Flux Pinning at Grain-Boudaries at High Fields and Low Temperatures in Bicrystalline SmBa₂Cu₃O_ySuperconducting Films

〇Yuji Tsuchiya¹, Junya Akita¹, Yusuke Ichino¹, Tatsunori Okada², Satoshi Awaji², Yutaka Yoshida¹ (1.Nagoya Univ., 2.Tohoku Univ.)

Keywords:superconductor, bicrystal, critical current

The critical current density J_c in the RE-based cuprate (REBCO) superconducting film is significantly degraded at grain boundaries. In recent years, REBCO films are used for application operated at low temperatures and high magnetic fields. However, there are few reports on J_c at grain boundaries in REBCO films in those conditions.
In this study, we fabricated a SmBa₂Cu₃O_y film with various misorietation angles using bicrystal substrates and measured J_c at grain boundaries at low temperatures and high fields up to 4.2 K and 24 T. Finally, the flux pinning at the grain boundaries were discussed based on the flux pinning for the Abrikosov-Josephson vortex