[A1-P304] Poster 304

[A1-P304-20] Crystal Defects in Polycrystalline Co-BaFe₂As₂ Bulk Superconductor

*Zimeng Guo¹, Hongye Gao¹, Koki Muraoka¹, Takaaki Harada¹, Yusuke Shimada^2,4, Shinnosuke Tokuta³, Yuta Hasegawa³, Akiyasu Yamamoto^3,4, Satoshi Hata^1,4 (1. Kyushu Univ. (Japan), 2. Tohoku Univ. (Japan), 3. Tokyo Univ. of Agriculture and Technology (Japan), 4. JST CREST (Japan))

Keywords:Fe-based superconducting bulk, grain boundary, crystal planar defect, pinning center