Nanoscale spin-state ordering in LaCoO3 epitaxial thin films

Ji Hwan Kwon, Woo Seok Choi, Young Kyun Kwon, Ranju Jung, Jian Min Zuo, Ho Nyung Lee, Miyoung Kim

Research output: Contribution to journalArticlepeer-review


The nature of magnetic ordering in LaCoO3 epitaxial thin films has been the subject of considerable debate. We present direct observations of the spin-state modulation of Co ions in LaCoO3 epitaxial thin films on an atomic scale using aberration-corrected scanning transmission electron microscopy (STEM), electron energy loss spectroscopy (EELS), and ab initio calculations based on density functional theory (DFT) calculations. The results of an atomic-resolution STEM/EELS study indicate that the superstructure is not associated with oxygen vacancies; rather, it is associated with a higher spin state of Co3+ ions and their ordering. DFT calculations successfully reproduced the modulation of lattice spacing with the introduction of spin ordering. This result identifies the origins of intrinsic phenomena in strained LaCoO3 and provides fundamental clues for understanding ferromagnetism in Co-based oxides.

Original languageEnglish (US)
Pages (from-to)2496-2501
Number of pages6
JournalChemistry of Materials
Issue number8
StatePublished - Apr 22 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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