Abstract Body

We have fabricated Gd123 thin films co-doped with several kind of RE₂CuO₄ (RE214: RE= Gd, Nd, Sm, Eu) by the FF-MOD method and investigated their superconducting properties. We will report that the introduction of the superconductor RE214 (T_C=18.5 K) as an APC into RE123 improved the J_C-B properties for the first time [1]. In this study, in order to improve the J_C-B properties, we tried to refine the RE214 crystals by co-doping several kinds of RE214 having different lattice constants and growing them independently in the base material. As a result, for the same volume fraction introduction, the J_C-B property improved with increasing the kind of RE214 introduced at the same time, and all films were improved over non-doped films. At 4.2K and 6.9T, the  was 0.782 MA/cm² with the addition of Sm214 alone, and 0.877 MA/cm² with the addition of three types (Gd214, Nd214, Sm214), representing increases of 1.07 times and 1.19 times, respectively, compared to the non-doped film. Moving forward, we expect further improvement in superconducting properties by altering the combinations of  in, their doping ratios, and the sintering conditions.

References

[1] R.Ishii, K.Sato, O.Miura,” Improvement of J_C-B properties by co-doping with optimized combinations of BaMO3 (M=Sn, Zr, Ce) for FF-MOD Gd123 thin film”, The Applied Superconductivity Conference2024, Utah(U.S.A), September 2024.

Acknowledgment

This work was supported by JSPS KAKENHI Grant Number JP 24KJ1858

Keywords: RE123,RE214, fluorine-free metal organic deposition, critical current density, high-T_C superconductor.