Transmission Electron microscopy and atomic force microscopy observation of air-processed GdBa2Cu3O7-δ superconductors doped with metal oxide nanoparticles (Metal = Zr, Zn, and Sn)

Caixuan Xu, Anming Hu, Masaki Ichihara, Mitsuru Izumi, Yan Xu, Naomichi Sakai, Izumi Hirabayashi

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11 Citations (Scopus)


Single-domain, c-axis-oriented 30-rnrn-diameter GdBa2Cu 3O7-δ (Gd123) melt-textured bulk superconductors have been successfully grown by the top-seeded melt growth method from precursors of Gd123, Gd2BaCuO5, and Ag2O in air with doping of nanosized ZrO2, ZnO, or SnO2. Transmission electron microscopy (TEM) unveils a large amount of BaZrO3 or BaSnO3 particles with an average diameter of approximately 50 nm respectively embedded in ZrO2 or SnO2 doped samples, while no Zn-rich nanoparticles are observed in the ZnO-doped samples. The critical temperature Tc is almost unchanged up to a doping amount of 10 mol% tor ZrO2- or SnO2-doped Gd123 melt-textured bulks, while ZnO-doped Gd123 becomes non-superconductive at this doping level. By atomic force microscopy (AFM), nanostripes with a wavelength of 15nm are observed in the ZnO-doped Gd123 sample. Nanoscale particles in the grown Gd123 single domain, together with the micro-defects induced by nanoparticle doping, can account for the enhanced superconducting properties.

Original languageEnglish
Article number023002
JournalJapanese Journal of Applied Physics
Issue number2
Publication statusPublished - 2009 Feb 1


ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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