Ultra-fast growth (up to 100 nm s ⁻¹ ) of heavily doped EuBa ₂ Cu ₃ O ₇ film with highly aligned BaHfO ₃ nanocolumn structure

Abstract

Abstract Ultra-fast growth (up to 100 nm s −1 ) of high temperature superconducting film was demonstrated by using an advanced pulsed laser deposition technique. Highly textured EuBa 2 Cu 3 O 7− δ (EuBCO) film with 8 mol.% of BaHfO 3 (BHO) was deposited on the IBAD-based Hastelloy substrates. Structure characterizations reveal formation of high density of BHO nanocolumns with diameter of ∼5 nm in the film, which is well beyond the expectation. Comparison study on different amount of BHO in EBCO film confirmed that nanocolumn formation strongly depends on the dopant level. The epitaxial growth process of BHO is dominated by ultra-fast self-assembly associated with enhanced diffusion of high flux element and liquid phase. Due to the correlated pinning landscape, a pronounced broad peak appears at B // c in the J c (θ) curves at 30 K 5 T, while a strong pinning force of about 900 GN m −3 at 4.2 K, 10 T ( B // c ) are achieved.