A new mechanism for misfit dislocation generation: Superdislocations associated with Ruddlesden-Popper planar defects

J. S. Wu*, C. L. Jia, K. Urban, J. H. Hao, X. X. Xi

*Corresponding author for this work

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

We have investigated by high-resolution transmission electron microscopy SrTiO3/SrRuO3 bilayer films epitaxially grown on LaAlO3 substrate. At the SrRuO3/LaAlO3 interface we frequently observe dissociated superdislocations in connection with Ruddlesden-Popper-type planar defects. These superdislocations can contribute to misfit relaxation equivalent to a perfect misfit dislocation with Burgers vector a〈110〉. The formation and the geometry of this defect arrangement is discussed in detail. The Sr-rich Ruddlesden-Popper-defect can be introduced by composition fluctuations during film deposition. It can be concluded that it can act as a source for the generation of misfit dislocations.

Original languageEnglish (US)
Pages (from-to)603-609
Number of pages7
JournalJournal of Crystal Growth
Volume234
Issue number2-3
DOIs
StatePublished - Jan 1 2002

Keywords

  • A1. High resolution electron microscopy (HRTEM)
  • A1. Interface structure
  • A1. Misfit dislocation source
  • A1. Partial dislocation
  • A1. Ruddleson-Popper planar defects
  • B1. Perovskites

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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