Superconductivity in Epitaxial Thin Films of Co-Doped SrFe2As2with Bilayered FeAs Structures and their Magnetic Anisotropy

Superconducting epitaxial films of Fe-based layered arsenide, Co-doped SrFe 2 As 2 , were grown at 700 °C on mixed perovskite (La,Sr)(Al,Ta)O 3 (001) single-crystal substrates by pulsed-laser deposition. Both the epitaxial film and an (001)-oriented film grown at 600 °C exhibited superconducting transitions at ∼20 K. The zero-resistance states of the epitaxial film were sustained under a magnetic field ( H ) of 9 T at 9 K when H was parallel to the c -axis, while they were sustained at higher temperatures up to 10 K for H parallel to the a -axis. This is the first demonstration of superconducting thin films of FeAs-based new superconductors.