Sm1+xBa2-xCu3Oy (SmBCO) films prepared by the low-temperature growth (LTG) technique showed a critical current density (Jc) as high as 0.28 MA/cm2 (77 K, B ∥ c,B = 5 T). However, Jc was lower than that of NbTi wire (4.2 K) above 5 T. In this study, we introduced nanoparticle superconductors with a low critical temperature (low-Tc) into LTG-SmBCO "LTG-SmBCO + nanoparticle" films to improve Jc under the high magnetic field, and obtained an extremely high Jc, 0.1 MA/cm2 (77 K, B ∥ c, B = 8 T). Energy-dispersive X-ray spectroscopy (EDX) showed that the "LTG-SmBCO + nanoparticle" films had a nanosize low-Tc phase and a low-Tc network dispersed in the high-Tc matrix. We concluded that the "LTG-SmBCO + nanoparticle" films could have enhanced Jc by the introduction of pinning centers and the improvement of irreversibility field (Bin).
|Journal||Japanese Journal of Applied Physics, Part 2: Letters|
|Publication status||Published - Jan 31 2006|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)