Thin film structure of yba2cu3o7-δ on (001) mgo substrate studied by tem

Hajime Suzuki, Hideyuki Kurosawa, Katsumi Miyagawa, Yoshihiko Hirotsu, Masanori Era, Tsutomu Yamashita, Toshio Hirai, Hisanori Yamane

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9 Citations (Scopus)

Abstract

A plan-view TEM observation was made for YBa2Cu3O7-δ (YBCO) thin films prepared by MOCVD on (001) MgO substrates. For the TEM observation, the MgO substrate plates were ion-thinned before the YBCO deposition. The YBCO thin films were found to be polycrystalline with a grain size of about 0.5µm. Most of the YBCO grains are grown with their [001] axes nearly normal to the MgO substrate plane. Between the neighboring YBCO grains, a small-angle misorientation was observed quite frequently. Most of the misorientation angles measured by selected-area electron diffraction were less than about 5 degrees. At the small-angle grain boundaries, a nearly periodic array of dislocations was observed in the high-resolution lattice images. The AC and DC Josephson effects of YBCO thin film bridges reported previously are discussed in relation to the small-angle grain boundaries.

Original languageEnglish
Pages (from-to)L1648-L1651
JournalJapanese journal of applied physics
Volume29
Issue number9
DOIs
Publication statusPublished - 1990 Sep

Keywords

  • AC Josephson effect
  • DC Josephson effect
  • Grain-boundary junction
  • Lattice imaging
  • MOCVD, YBCO thin film
  • Small-angle grain boundary
  • TEM observation

ASJC Scopus subject areas

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

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