Fabrication of a superconducting YBa ₂ Cu ₄ O ₈ film via coprecipitation

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We have successfully synthesized the c -axis oriented YBa 2 Cu 4 O 8 (Y-124) film on a SrTiO 3 (1 0 0) substrate via a coprecipitation and dip-coating method. The precipitations including Y, Ba and Cu ions were obtained using their metal nitrates solution and the aqueous solution of sodium hydroxide and oxalic acid. Superconducting transition of the synthesized film was observed at 64–70 K corresponding to bulk Y-124 in the magnetization and resistance measurement. The developed method is suitable to synthesize superconducting Y-124 films for technological applications.