Publication date: Available online 10 January 2017
Source:Thin Solid Films
Author(s): B. Kang, D.H. Tran, W.N. Kang
We have investigated the flux pinning force Fp in pure and 2 wt.% BaSnO3 (BSO)-added GdBa2 Cu3 O7 − x (GdBCO) superconducting films. Both pure and BSO-added GdBCO films with the thicknesses varying from 0.2 μm to 1.5 μm were prepared by using a pulsed laser deposition (PLD) technique. As BSO is added to the GdBCO films, two changes were observed in the field dependence of the pinning forces. First, the magnitude of the pinning force was greatly enhanced at each corresponding thickness. Second, the pinning forces exhibited an interesting plateau-like behavior. As a result, a universal scaling law of the pinning forces can be applied to the BSO-added GdBCO films which accounts for all variation in thickness. These results suggest an existence of an extra pinning mechanism through the film thickness which is induced by the formation of the BSO nanostructures. PACS numbers 74.25.Sv 74.25.Qt 74.62.Dh 74.72.Jt
Source:Thin Solid Films
Author(s): B. Kang, D.H. Tran, W.N. Kang