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Preparation and Characterization of Superconducting Y–Ba–Cu–O Films by the MOCVD Technique

1990; Institute of Physics; Volume: 29; Issue: 6R Linguagem: Inglês

10.1143/jjap.29.1070

1347-4065

Hiroshi Ohnishi, Yoshihiko Kusakabe, Minoru Kobayashi, Susumu Hoshinouchi, Hiroshi Harima, Kunihide Tachibana,

Magnetic and transport properties of perovskites and related materials

Superconducting Y–Ba–Cu–O thin films were obtained by the MOCVD technique on MgO(100) substrates at 715°C without postannealing. β-diketonate chelates were used as source metal organic complexes. This paper describes the film characterizations of electrical resistivity, composition, surface morphology and microstructure. Superconducting films were composed of a dense matrix and dispersed particles. The Y–Ba–Cu composition of the matrix was close to the 1:2:3 superconducting phase, while the particles were mainly composed of CuO. The highest zero-resistant temperature obtained in this experiment was 85 K. The film was highly oriented with the c -axis normal to the substrate. The lattice constant of the film was 11.68 Å.