Control of grain size by initial growth stage of YBCO thin films

M. Mukaida, S. Sato, Y. Takano, M. Kusunoki, S. Ohshima

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6 Citations (Scopus)


A grain size control technology will be described. YBa2Cu3O7-δ thin films are grown by a pulsed laser deposition method in 400 mTorr oxygen atmosphere. The films are grown by a self-template method with various self-template growth temperatures. However the temperature of the main YBa2Cu3O7-δ layer was fixed. Grain size of YBa2Cu3O7-δ thin films on MgO substrates are observed by atomic force microscope. Mean diameter of grains are calculated by the number of grains in scanned area of 1 × 1 μm2. The mean diameters are 2.49 × 102, 2.89 × 102, 4.047 × 102 and 4.192 × 102 nm for films with an initial layer growth temperature of 670, 690, 714 and 730 °C, respectively. Grain size is found to depend on the initial growth stage of the YBa2Cu3O7-δ thin film growth. These grain sizes have a strong relationship with the inverse of substrate temperature indicating thermally excited migration of YBa2Cu3O7-δ nuclei. It is also clarified that migration length of YBa2Cu3O7-δ nucleus is longer on an YBa2Cu3O7-δ films than on MgO substrates.

Original languageEnglish
Pages (from-to)1232-1235
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue numberPART 2
Publication statusPublished - Oct 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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