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Superconducting thin films of YBa2Cu3O y on a metallic substrate are prepared in situ by a pulsed laser ablation technique. The growth quality of the superconducting YBa2Cu3O y films has been compared on YSZ/Hastelloy substrates with or without a Pt underlayer. The zero-resistance temperature, T co, of 90.0 K and a transport critical current density, J c, greater than 4.0×104A/cm2 at zero field and 77.4 K were achieved when a YSZ/Pt/Hastelloy substrate was used. The insertion of a thin Pt layer at the boundary between YSZ and Hastelloy stabilized the YSZ buffer layer, resulting in the subsequent growth of a well-crystalline YBa2Cu3O y film.

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