High critical current density and its magnetic fields dependence in (Sm,Eu,Gd)Ba2Cu3Oy films by using multiple targets

Melt textured bulks of (Sm0.33Eu0.33Gd0.33)Ba2Cu3Oy (SEG123) show high Jc compared with that of YBa2Cu3Oy (Y123), because of nanoscopic network consisting of crossing rare earth (RE) compositional stripes. In this study, we fabricated SEG123 films by using pulsed laser deposition (PLD) method on LaAlO3 (LAO) substrates and evaluated the Jc and Tc in magnetic field. Jc of the SEG123 film was typically 1.4 MA/cm2 at 77 K in self-field. Jc in self-field of SEG123, Y123 and Sm123 films were almost the same value, however, Jc in magnetic fields showed a notable difference. The Jc of SEG123 film were 62.7 kA/cm2 at 5 T. We conclude that the Jc in magnetic fields were improved by RE-rich particle made of RE/Ba substitution acting as 3-dimensional pinning centers. Moreover we have confirmed that the superconducting properties changes by varying Sm, Eu and Gd composition ratio.

► We fabricated (Sm,Eu,Gd)Ba2Cu3Oy (SEG123) films on LaAlO3 by using PLD method.
► SEG123 film showed high-Jc in high magnetic fields and high irreversibility fields.
► We anticipate RE-rich particles acting as 3D PC are included within the SEG123 films.
► The superconducting properties changes by varying Sm, Eu and Gd composition ratio.
► We expect SEG123 is effective materials for applications in high magnetic fields.