Abstract
Extremely smooth single crystal YBa 2Cu 3O 7− δ “thin” films, 1–3 μm thick, have been successfully grown on YBCO-seeded MgO substrates by liquid phase epitaxy. The morphology study on the as-grown samples has revealed a step-flow growth mechanism, with each step height of about 1.1 nm, i.e. the c-axis lattice constant of YBCO. The mean surface roughness in a large 25 μm×25 μm area is ∼0.76 nm, determined by an atomic force microscope. After annealing in pure oxygen, the ∼2 μm thick films exhibit high-quality high- T c superconductivity with zero resistance transition temperature T C0≈91 K and critical current density J C=4.74×10 4 A/cm 2 (transport measurement with 1 μV/cm criterion) at 77 K.
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