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

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

19 Citations (Scopus)


We have investigated by high-resolution transmission electron microscopy SrTiO3/SrRuO3bilayer films epitaxially grown on LaAlO3substrate. At the SrRuO3/LaAlO3interface 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
Pages (from-to)603-609
Number of pages7
JournalJournal of Crystal Growth
Issue number2-3
Publication statusPublished - 1 Jan 2002
Externally publishedYes


  • 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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