REBa2Cu3Oy (REBCO) grown by reel-to-reel pulsed laser deposition (RTR-PLD) coated conductors (CCs) are expected to be used in magnet application because of their excellent high-field superconducting properties. However, further improvement of the critical current density (Jc) is still required for practical use. The introduction of BaHfO3 nanoparticles (BHO NPs) [1,2] and irradiation-induced defects [3] as flux pinning centers have been reported to improve in-field Jc properties. Recently, S. Eley et al. reported the enhancement of Jc for REBCO CCs with oxygen-irradiated defects [4].
In this work, to investigate the effect of coexisting BHO NPs and irradiation-induced defects on the superconducting properties of RTR-PLD (Eu,Er)Ba2Cu3Oy CCs, we prepared (Eu,Er)BCO+BHO CCs with various irradiation fluences. Although Tc and Jc decreased immediately after irradiation, they recovered almost all of their original properties after oxygen annealing treatment. The (Eu,Er)BCO+BHO CCs with 1×1013 O ion/cm2 show higher in-field Jc properties compared to that in unirradiated (Eu,Er)BCO+BHO CCs at high temperature (65 - 77 K). To understand these Jc improvements for oxygen-ion irradiated (Eu,Er)BCO+BHO CCs, we used a simple pinning model in the analysis [1]. We see that the calculated Jc using our pinning model is good agreement with the experimental Jc. The pinning model and detailed in-field superconducting properties for (Eu,Er)BCO+BHO CCs with oxygen irradiated defects will be presented.
Acknowledgements:
This work at Seikei University is supported by JST-FOREST (Grant Number JPMJFR202G). A part of this work at AIST was supported by the New Energy and Industrial Technology Development Organization (NEDO).
Reference
[1] M. Miura et al., NPG Asia Materials 9 (2017) e447.
[2] M. Miura et. al., NPG Asia Materials (accepted on Sep. 6th, 2022)
[3] M. Leroux et al., Appl. Phys. Lett. 107 (2015) 19260.
[4] S. Eley et al., Supercond. Sci. Technol. 30 (2017) 015010.
Keywords: REBCO, ion iradiation, critical current, PLD