To enhance the critical current density (Jc) of Sm-Ba-Cu-O (SmBCO) superconductors, a small number of Y2O3 particles of nano scale (nmY2O3) were used. The Jc-H (the applied magnetic field) results show that the increase in Jc using nmY2O3 occurs mainly in high fields. In addition, by increasing the number of nmY2O3 particles, the flux pinning force-reduced magnetic field (Fp-h) curves shift to the right. The above results indicate the formation of δTc pinning centers. The microstructure results show that Y2O3 particles react with the 211 (Sm2BaCuO5), 123 (Sm 1Ba2Cu3O7) and liquid phases at high temperatures. Both the high solubility of Sm in the liquid and the inter-diffusion of Sm and Y at high temperatures result in compositional fluctuations [(Sm,Y)-Ba-Cu-O]. It is considered that these compositional fluctuations contribute to δTc pinning. Finally, to determine the effect of compositional fluctuation caused by a different method, these results were also compared with those of the nano sized Y211 (nmY211)-doped samples.
|Number of pages||4|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Publication status||Published - 2006 Nov 15|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)