Polar cation ordering: A route to introducing >10% bond strain into layered oxide films

Brittany B. Nelson-Cheeseman, Hua Zhou, Prasanna V. Balachandran, Gilberto Fabbris, Jason Hoffman, Daniel Haskel, James M Rondinelli, Anand Bhattacharya*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The 3 d transition metal (M) perovskite oxides exhibit a remarkable array of properties, including novel forms of superconductivity, magnetism and multiferroicity. Strain can have a profound effect on many of these properties. This is due to the localized nature of the M 3 d orbitals, where even small changes in the M-O bond lengths and M-O-M bond angles produced by strain can be used to tune the 3 d-O 2 p hybridization, creating large changes in electronic structure. A new route is presented to strain the M-O bonds in epitaxial two-dimensional perovskite films by tailoring local electrostatic dipolar interactions within every formula unit via atomic layer-by-layer synthesis. The response of the O anions to the resulting dipole electric fields distorts the M-O bonds by more than 10%, without changing substrate strain or chemical composition. This distortion is largest for the apical oxygen atoms (O ap), and alters the transition metal valence state via self-doping without chemical substitution.

Original languageEnglish (US)
Pages (from-to)6884-6891
Number of pages8
JournalAdvanced Functional Materials
Volume24
Issue number43
DOIs
StatePublished - Nov 19 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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