[10p-A31-1~16] 11.2 Wires, Bulks, Fabrication process, Power applications

1:15 PM - 1:30 PM JST(4:15 AM - 4:30 AM UTC)

[10p-A31-2] Flux Pinning Mechanism at Low-Temperature and High-Field in REBCO Tapes with various Oxygen Vacancy Contents

〇(M1)Tomoki Fukushima¹, Kengo Miyakawa¹, Ryosuke Sakagami¹, Yuji Tsuchiya¹, Satoshi Awaji¹ (1.IMR, Tohoku Univ.)

Keywords:

REBCO tape,oxygen annealing,critical current density

While the enhancement of critical current density (J_c) through carrier overdoping is known in REBCO thin films, quantitative evaluation separating its effects on the matrix and pinning centers in commercial coated conductors with artificial pins remains insufficient. In this study, we performed low-temperature oxygen annealing on commercial BHO-doped EuBCO tapes manufactured by Fujikura and evaluated their J_c under low-temperature and high-magnetic-field conditions. As a result, the sample annealed at 300°C exhibited an enhancement in J_c at 4.2 K and 15 T. In the presentation, we will discuss the mechanism of this J_c enhancement and the origin of the pinning centers by separating the contributions of the matrix and pinning using the weak collective pinning model.