For high critical current density (Jc) in a magnetic field, we have improved the Jc of trifluoroacetate metal organic deposition (TFA-MOD) (Y0.77Gd0.23)Ba2Cu3Oy by introducing various incoherent BaMO3 (BMO: M = Sn, Zr, Hf) nanoparticles (NPs) [1-4]. Especially, 12vol.% BHO doped (Y,Gd)BCO coated conductors (CCs) show the highest self-field and in-field Jc compared to that of other CCs . However, the influence of large quantities of BHO NPs on the superconducting properties of (Y,Gd)BCO+BHO CCs has not been clarified.
In this work, to study of the influence of large quantities of BHO NPs on the superconducting properties over a wide temperatures range (26 - 77 K), we fabricated (Y,Gd)BCO CCs with different BHO nanoparticle additions. (Y,Gd)BCO CCs doped with over 16 vol.% BHO have slightly lower crystallinity and self-field Jc compared to the other CCs. As a result, the in-field Jc for CCs doped with large quantities of BHO is lower than that of 12 vol.% doped CC. Detailed microstructural and superconducting properties will be presented.
Acknowledgements: This work was supported by JST-FOREST (Grant Number JPMJFR202G, Japan). A part of this work was supported by JSPS KAKENHI (18KK0414 and 20H02184).
 M. Miura et al., Supercond. Sci. Technol. 26 (2013) 035008.
 M. Miura et al., Phys. Rev. B 83 (2011) 184519
 M. Miura et al., NPG Asia Materials 9 (2017) e447.
 M. Miura et al., NPG Asia Materials (accepted on Sep. 6th, 2022)