[20p-W810-1~10] 11.3 Critical Current, Superconducting Power Applications

[20p-W810-2] Size effect of Y₂O₃ nano-precipitates on the flux-pinning properties of YBCO thin films

〇Hirofumi Yamasaki¹, Hiroaki Matsui¹ (1.AIST)

Keywords:YBCO thin film,flux pinning,size effect of nano-precipitates

The magnetic-field angle dependence of the critical current density Jc(H, θ) was measured at various temperatures in two co-evaporated YBCO thin films that contain high-density of very fine Y₂O₃ nano-precipitates. Different particle sizes have caused an interesting crossover in temperature dependent in-field Jc values. The film containing finer precipitates showed higher Jc at low temperatures in spite of considerably lower Jc at high temperatures.