Atomic-resolution imaging of spin-state superlattices in nanopockets within cobaltite thin films

Jaume Gazquez, Weidong Luo, Mark P. Oxley, Micah Prange, Maria A. Torija, Manish Sharma, Chris Leighton, Sokrates T. Pantelides, Stephen J. Pennycook, Maria Varela

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

Certain cobalt oxides are known to exhibit ordered Co spin states, as determined from macroscopic techniques. Here we report real-space atomic-resolution imaging of Co spin-state ordering in nanopockets of La 0.5Sr0.5CoO3-δ thin films. Unlike the bulk material, where no Co spin-state ordering is found, thin films present a strain-induced domain structure due to oxygen vacancy ordering, inside of which some nanometer sized domains show high-spin Co ions in the planes containing O vacancies and low-spin Co ions in the stoichiometric planes. First-principles calculations provide support for this interpretation.

Original languageEnglish (US)
Pages (from-to)973-976
Number of pages4
JournalNano letters
Volume11
Issue number3
DOIs
StatePublished - Mar 9 2011

Keywords

  • Cobaltites
  • O vacancies
  • electron energy loss spectroscopy
  • spin state

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