Epitaxial YBa₂Cu₃O_7-y thin-film growth on NdGaO₃ substrate by laser ablation

As-grown superconducting YBa₂Cu₃O_7-y thin films with various thicknesses were successfully grown on lattice-matched NdGaO₃ substrates by ArF laser ablation deposition. An as-grown 2000-Å-thick film has a zero-resistance temperature (T_c) at 90 K and a 170-Å-thick film has a T_c at 88 K. The existence of a thin interfacial diffusion layer between a 170-Å-thick film and the substrate was observed by Auger electron spectroscopy. Rutherford backscattering spectroscopy suggest that as-grown YBa₂Cu₃O_7-y films on NdGaO₃ substrates are high-quality crystals. It is demonstrated that the NdGaO₃ has considerable potential as an electronic substrate material by less interfacial diffusion layer and good crystallinity of grown thin films.