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

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

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A grain size control technology will be described. YBa 2 Cu 3 O 7-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 YBa 2 Cu 3 O 7-δ layer was fixed. Grain size of YBa 2 Cu 3 O 7-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 μm 2 . The mean diameters are 2.49 × 10 2 , 2.89 × 10 2 , 4.047 × 10 2 and 4.192 × 10 2 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 YBa 2 Cu 3 O 7-δ thin film growth. These grain sizes have a strong relationship with the inverse of substrate temperature indicating thermally excited migration of YBa 2 Cu 3 O 7-δ nuclei. It is also clarified that migration length of YBa 2 Cu 3 O 7-δ nucleus is longer on an YBa 2 Cu 3 O 7-δ films than on MgO substrates.

Original languageEnglish
Pages (from-to)1232-1235
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume378-381
Issue numberPART 2
DOIs
Publication statusPublished - Oct 1 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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