Journal
CHEMISTRY OF MATERIALS
Volume 26, Issue 8, Pages 2496-2501Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm5003115
Keywords
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Funding
- National Research Foundation of Korea(NRF) grant
- Korea government (MSIP) [NRF 2013034238, NRF 2013050169]
- Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy
- National Institute of Supercomputing and Networking/Korea Institute of Science and Technology Information [KSC-2012-C2-088]
- Kwangwoon University
- Institute for Basic Science (IBS) in Korea
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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.
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